You guys need to reread the OP's posts. He is talking about TWO engines. One is a 451 stroker for which the open chamber heads and "quench dome" pistons are a natural combination. He also has a set of 915s that he could use if the piston is a long way under the deck by milling off part of the dome to get squish. It's been done before.

The second engine is his big motor. That's the one the big heads are for. It is going to be a street beast for daily (?) driving.

Then he has the extra valves, a nice complete set. I'd suggest putting them into his 452 open chamber heads on the smaller stroker.

Rapid, if I misunderstood straighten us out.

R.