Welcome aboard boattruck.
The T-16B has a wheelbase of 157 inches. The original engine is a 230 cu in Oldsmobile. I show a block casting number 408003. The engine number will be at the top front driver side just below the head, stamped on a machined boss. The T indicates a truck engine which had a few differences from the passenger engine. Primarily cam, carb and no vacuum advance on the distributor.