I'm building one based on a 153 because it's the closest to a vintage Chevy 4 cylinder ("62-'70) if you don't want to go back to 1928. The 181 Mercruiser or the 151 Iron Duke would work well for you. I'm sure someone will suggest the 4s from The Chevy Colorado.
This thread has some info and pictures. GM 4 cylinders 151 153 181 Probably have to paste it in the search window.
