So ive a little 39 dodge pickup truck thats been turned into a roadster. Ive got the steel for the frame, ford 9" rear end, 40 ford front end, 34 chevy grille, etc. But im still looking for the RIGHT motor for it. These are cheap, near the same price, thus my options. 1930 model A motor and truck tranny. Runs but smokes black. a 1954 plymouth flathead six and auto. runs and shifts well. a 1948 caddy flathead v8, rebuilt 25 years ago and has been sitting, with auto.