Remember that if you mill the 452s enough to get decent compression increase, you'll also need to consult "the experts"/chart to see how much you'll need to also mill the intake manifold sides so they all fit together well. THEN, the intake manifold and heads become a "matched set", so to speak. Just a normal "surface/true" cut, no worries, generally.
That "cool factor" can be a good bit of work to keep it all working "as designed", which the magazines don't usually mention. Plus expense! Especially when the engine might spit-back when starting, which then means a new power valve in that center carb. But if you desire to learn about these things . . .
Enjoy!
CBODY67