Install 392 (Gen 1)Hemi

The transmission bell housing pattern is the same as the small block with the exception that the dowels are in different locations, so the transmission tunnel should require little to no modification. There are a couple of members who've done the swap. Maybe they will chime in.

Also, I would lose the 392 heads. They are inferior to the 54 and up 331 and 354 heads. The intake ports are much longer and curve downward in the port floor. Rather than cast different intakes to make up the difference with the tall deck 392, Chrysler made the heads wider at the intake ports.

By installing the 392 size valves in the 331 or 354 heads, you end up with a much better flowing head. This of course does not include the 51-53 small round exhaust port 331 heads. They are doorstops.