Valves for 452 Heads
I could sell you SI valves, but the intake and exhaust 2.14" & 1.81" are currently sold out for a few months.
Honestly your wasting your time installing big valves on that small a cubic inch engine. You're going to lose the most important part of the combination.
AIR SPEED!
I have a 499RB with 236/242 duration .570" lift solid roller cam and I still run stock valve sizes in my heavily ported 452 heads. It's not that I couldn't put big valves in them.
I choose not to put them in a street engine.
Tom