What is the casting # (behind drivers side head, on the block near b'housing)?
Probably a 283............327's were introduced in CARS in '62......I don't know when they started putting them in trucks.
350's are almost free and cost the same to rebuild.........unless the engine in question is fresh........then buy for the engine, part out the rest.
Personally, I don't do business with family or close friends. If something goes south on the deal, there can be hard feelings......can make the holidays tough if it's in-laws......
