Just Thinking what do you all think

If I was going with an early hemi, I'd use a bigger starting point, at least a 331/ 354, and hope for the sky, a 392.

Be aware that Dodge, Desoto, and Chrysler were in most cases different engines, and a few had "part of the bellhousing" built into the block

Parts for some of them can be truely dear to come by.