1976 350 id

I'm sure I could get close online with this but just not having any luck.

Have a 350 w/ q-jet & AT, came original in 1976 Nova Concours. Believe it has the flat top pistons w/ 4 valve reliefs ( a generic name for these?) It does have 882 open chamber heads. As much as I could research, Compression should be 8.2 to 1. But not sure.

Object of the game: Can come up with either 67cc or 76cc heads, trying to put compression in high 9's so cam will work good, but don't want to go over of course into racing gas territory.

My small block experience is just not deep enough to dig up the answer on my own, does anyone have or been through this combination?

Thanks,

Rootsgroup