Those peanut port heads are never going to be performance heads on a 454. You'll run out of RPMs. If you wan't to go to 10:1, aluminum heads would be in order. Perhaps the Edelbrock Performer RPM heads with matching intake and cam. Be prepared to spend some money. Building a BBC isn't cheap. I used iron open chamber heads, a Comp Cams 292H (If I remember correctly), 9.6 CR, Edelbrock dual plane with a Holley 800 DP. That's a mid-80's combo that may not be the best today, but it made my 30 A-bone sedan run like a scalded cat.

You might want to see if JohnnyO or Tech want to chime in. I've built a few big blocks, but I'm certainly no expert.