Just rebuild it 30 over with -5cc flat tops. get the block decked so you end up with a net
.040" quench clearance. EG: .028" gasket .012" deck. The heads are fine as is.
The cr will be 10:1 The GM LT4 Hot cam will work well.
There are many ways to juggle that and many gaskets to choose.
Do not under gear it. slowing down a cammed motor does not work well.
Cammed motors need rpm.
the Mini Ram is not a low rpm induction system. It wants rpm.
The exhaust system will make or break it.