I`m about to fire up new engine. I have complete MSD ignition. My previous engine had 8.5 to 1 pistons. I set base timing at 10* and used a 25* bushing for a total timing of 35*. This was with light springs, full advance all by 2500 rpm. It ran great with these specs.
My new engine has 10.1 to 1 pistons, iron heads and a roller cam with 110 LSA. I am figuring on leaving the advance rate springs as they are ( in by 2500 rpm ). I would like to set base timing at 12* and run a 18* bushing, for total timing of 30*. Would this be safe with pump gas? What octane can I get by with?