Those heads would have maximum value on a 600hp engine built on a 400 block. The chambers do appear deep so let's assume they are indeed 90cc. They would give a comp ratio between 10.0 and 10.5:1 using a zero deck flattop piston and 0.039" gasket. Probably run on midgrade. The combustion chamber general shape isn't bad.
Putting them on a 400 block lets you use a 440 intake and that opens up more choices, and I believe better choices.

Oil collecting in the extra-deep valve spring pockets could be drained off with a hand drill or a die grinder with a cutoff wheel. Slots just have to work, they don't have to be precise.

That's my

R.