Head limitations for 430 engines

[Pinhead64US]

I'm looking into purchasing a 430 for a future project and am wondering if aftermarket big valve heads can be used despite having a bore smaller than the 455?

[70 gsconvt]

I have a set on my 455 block. You can grind out the combustion chambers to match the 455's bore, and give yourself a great polishing job at the same time.