Don't know what kind of horse power your looking for and I did consider (even purchased) a "baby hemi" from a 1954 Dodge Coronet. These are 241 ci and the one I picked up had been previously bored 60 over. Never got around to mating it to a transmission but my choice would have been some version of the Torqueflite. Eventually, after a friend gave me a 230 flathead out of a 1956 1 ton, I went with that. I bored it 60 over, put in a mild cam with factory 2bb Stromberg and Fenton headers. Additionally, I swapped out the transmission for a Borg-Warner S10 five speed with overdrive and a 3.73 axle from a Ford Ranger. Eventually, I'll install front disc brakes. While not exactly a speed demon, it's plenty fast for my needs, which are mainly to stay out of everyone's way.