The point is it's the combo! It doesn't mean a thing that you could get away with something if everything falls into place,I know from experience,not reading a magazine and false assumtions. The poster is putting this in a truck! Not a much lighter A body. I don't think Spending the higher price for 91 octane is at all logical for the application. I built 360's with near 11 to 1 comp using magnum heads in the mid 90's and yes I agree they will tolerate slightly more comp I won't tell someone building for THIS APPLICATION that it's the smartest thing to do,Period.