I was thinking that a set of 4X heads off a 400, with the 98 CC chambers would work well. They still say 4X on them and would appear original. But it seems the OP probably wont go for that option. Cutting .060 of the heads he has would put them close to 100 CC which would also work.
A comp cams XE 262 would do pretty well in that combe with a tall gear and stock converter. An XE 268 would also work, just reduce the dynamic a Tad
Static CR would be 8.88 and Dynamic would be 7.53 with cam installed straight up. This is also without decking the block or milling the heads, using flat top pistons with 6 CC reliefs, .042 Head gasket
Not sure that would put it at 450 horses, but on a 455, with a Qjet, Headers and duals, recurved dizzy, I would think it would be close.Just sayin
Fact is stranger than Fiction