Neat engine.
A couple years ago I did a 72 455HO with the same 7F6 heads, HO aluminum intake, but the heads were ported and compression bumped to 9.98:1.
Paul C did a nice custom hydraulic roller for it 239/243 @ .050 on a 112 LSA that made good power with the RA manifolds in place. 507/571 and peaked at 5600rpm. It idled nice and ran the AC and power brakes.
I'd probably tame that down a bit for what you're doing. I imagine your compression will be lower as well since those heads have pretty big chambers. Being a 4 speed will be nice, no converter to worry about. The really common 230/236 Comp cam chosen for many builds like this would work well enough from what I've seen and make decent power. Cliff has used that cam quite a bit as well as several others, and is something that Butler sells a lot of.
In fact Cliff and others have dyno numbers they have shared on builds almost exactly like that.
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