I love old school construction. Plumb bobs, slide rules, transits/builders level. Drawings and lumber lists on a block of wood or a lunch sack. Many of those guys were craftsmen and geniuses
My guess, this was for sure a bootleg running operation. Stock looking 40 Ford with license plate, and a early 50’s Oldsmobile engine being put in it! …… Street sleeper, I don’t think so.