I believe I have the factory posi with 3.55:1 We do have ethanol free premium at 92 octane here. Hope it works and if not, I'll run an octane boost every tank. They used the 744 cam the first half of the year and then switched to the 67/68. Something about being to radical and revving too high? I'm looking more for low end grunt while keeping it an HO, but if the cam needs a different grind, I'm not opposed.
