octane of fuel i should run

yellow rose said
You have enough cam to run it on pump gas.

My question is how do you have a 12 cc dome and be under 13:1? Did you actually measure the CR or are you going by published numbers?

calculated.
4.070 bore
3.31 stroke
12.6 cc dome
0 deck
72cc chamber volume. likely larger but havent cced they are open chamber
.039 head gasketheads