Ernie,
I am running 11:1 compression in the 69 and have no real problems with it. This crap they sell here for gas works about the same on any compression ratio. And I have the original iron high rise heads also. I had thought about changing to aluminum heads but decided these are good enough for me. When I want to drive hard, I fill the tank with my good ole 110 octane leaded racing gas. Then when I drive by everyone wonders what I have in the car as most of these young people have never used or seen real gas.
Ron
