Best answer to any engine question I can give you is this.
What is your intended purpose?
If it is a car, like mine for example. I am rebuilding it to stock specs, stock compression with a Comp Cams OEM regrind which has better centerline and overlap. This motor will run 104 to 108 octane. Will it be a daily driver? no, but maybe a few times a week.
If you are looking for a motor to run pump gas, your machinist will tell you what you need to get there.
If I may be so bold to assert this bit of information, Pontiacs are very different than Chevys, Fords and Mopars. I will suggest you find a Pontiac only machinist (Butler/Kauffman/Nunzi/Bischop/Spotts/Jim Taylor) You will pay a little more, but the overall result is that it is built right.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
