[RodKnock]

big-boss, with those cast iron heads, I think 9.5:1 CR is about all you want here in CA. I know that the 91 octane in my neighborhgood is awful. Fortunately, there's a local Union 76 station that offers 100 octane unleaded from the pump and 110 leaded from barrels in the back room. Also, one of the disadvantages of a tighter LSA of 108 is that it will be more likely to ping/detonate. Just my humble opinion, but I would change the cam, especially if you want to be able to run the terrible CA gas.