Building a bbc for my dodge. Going with a 060 454, hyd. roller. Shooting for 9.5 or 10 to 1 comp. I'm using 781 round port heads. What size dome do I need to get that comp ratio? I know chevy heads vary but I was thinking these heads have 122 chambers, may be wrong on that. Any recommendations? Heads will have some bowl and intake port work and they done have 2.19 and 1.88 valves.