There is no way to know exactly what it was built as unless you find the build card - these went out with the vehicle, often hidden behind the dash or centre windscreen strip. Sometimes they were shoved in the tub reinforcing strips under the rear floor. Usually they have long since rotted away by now though.
The info from Gaydon will tell you the build colour, engine type, and build date as well as where the vehicle was dispatched to (usually a dealership). As the body specifications were not recorded by the factory for each individual vehicle it is not possible to get the info from them. The chassis number will reveal if the vehicle was a utility (van, pickup, soft top) or a station wagon though, at least until the unified chassis sequences came in in the mid-1970s.