Looking to buy/build 500-600 fwhp 360

Nat said
how premium is the premium ? my car would ping on 91 octane 11.2 ran fine on 93 octane with alu heads you might dot on 91 if the tune is spot on

It's 91 octane but I'm at 3200 feet. I'm going to be running an MSD ignition which will allow me to easily retard the timing on a hot day, etc.