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There were only 12,055 XK 120 made between 1948-1954 and starting at chassis number 670001. This one is chassis number 670220 clearly stamped on the frame and written XK120M670220 in my owners manual. This is a steel frame, steel body, aluminum hood, doors and trunk production car. My owners manual shows the Engine number being W 6101-8 S but the engine block in this car is marked W 1463-8. The body number is stamped F1288. 

I completely rebuilt the engine and head June 2013, rebuilt steering box and installed a modern rear main seal. I upgraded the transmission with a modern 5 speed  kit designed specially for the xk120. Other upgrades include flame thrower distributor, solid core plug wires, electric fan, steering mantel with signal light switch, stainless steel sport exhaust and Dynalite alternator which looks like the original dyno generator. I'm just finishing the dash in this car so, please note the headlight switch knob and bezel is ordered.  I will try to add more pictures and video. Here is a little history lesson from Wikipedia.

The XK120 was launched in open two-seater or (US) roadster form at the 1948 London Motor Show as a testbed and show car for the new Jaguar XK engine. The display car was the first prototype, chassis number 670001. It looked almost identical to the production cars except that the straight outer pillars of its windscreen would be curved on the production version. The roadster caused a sensation, which persuaded Jaguar founder and design boss William Lyons to put it into production.

Beginning in 1948, the first 242 cars wore wood-framed open 2-seater bodies with aluminium panels.^[4] Production switched to the 1cwt or 112 lb (51 kg) heavier^[5] all-steel in early 1950. The "120" in the name referred to the aluminium car's 120 mph (193 km/h) top speed (faster with the windscreen removed), which made it the world's fastest production car at the time of its launch.^[6] In 1949 the first production roadster, chassis number 670003, was delivered to Clark Gable.

The XK120 was ultimately available in two open versions, first as an open 2-seater described in the US market as the roadster (and designated OTS, for open two-seater, in America), then also as a drophead coupe (DHC) from 1953; and also as a closed, or fixed head coupe (FHC) from 1951.

A smaller-engined version 2-litres, 4 cylinders, intended for the UK market was cancelled prior to production.

On May 30, 1949, on the empty Ostend-Jabbeke motorway in Belgium, a prototype XK120 timed by the officials of the Royal Automobile Club of Belgium achieved an average of runs in opposing directions of 132.6 mph with the windscreen replaced by just one small aeroscreen and a catalogued alternative top gear ratio,^{[note 1]} and 135 mph with a passenger-side tonneau cover in place.^[7] In 1950 and 1951, at a banked oval track in France, XK120 roadsters averaged over 100 mph for 24 hours and over 130 mph for an hour, and in 1952 a fixed-head coupe took numerous world records for speed and distance when it averaged 100 mph for a week.

Roadsters were also successful in racing and rallying.

The first roadsters, hand-built with aluminium bodies on ash frames mounted on modified Jaguar Mark V chassis, were constructed between late 1948 and early 1950. To meet demand, and beginning with the 1950 model year, all subsequent XK120s were mass-produced with pressed-steel bodies. They retained aluminium doors, bonnet, and boot lid. The DHC and FHC versions, more luxuriously appointed than the roadsters, had wind-up windows and also wood veneers on the dashboard and interior door caps.

With alloy cylinder head and twin side-draft SU carburetors, the dual overhead-cam 3.4 L straight-6 XK engine was comparatively advanced for a mass-produced unit of the time. With standard 8:1 compression ratio it developed 160 bhp (119 kW),^[2] using 80 octane fuel. Most of the early cars were exported; a 7:1 low-compression version, with consequently reduced performance, was reserved for the UK market, where the post-war austerity measures then in force restricted buyers to 70 octane "Pool petrol". The Jaguar factory, with access to 80 octane fuel, provided roadsters with the higher compression ratio to the press. Journalists could then test the model's optimum performance in Belgium, on a long, straight stretch of road between Jabbeke andOstend.^[8] The XK engine's basic design, later modified into 3.8 and 4.2 litre versions, survived into the late 1980s.

All XK120s had independent torsion bar front suspension, semi-elliptic leaf springs at the rear, recirculating ball steering, telescopically adjustable steering column, and all-round 12 inch drum brakes^[3] that were prone to fade. Some cars were fitted with Alfin (ALuminium FINned) brake drums to help overcome the fade.

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