Mild 360 Magnum Build

Gotcha... sounds good! Using 87 at 10:1 CR is a challenge. My old 10+ CR 351C was used for street racing, hard mountain road driving, towing, DD, everything, with 18-19 mpg highway. It was a very flexible engine, and both the CR and good breathing were the basis for that. But it needed 93 premium. It was just beyond my skills at the time to tune/de-tune for 87. (I did try....)