I have the Holley Sniper on my 350 small block and love it once we got it dialed in after some fouling of the O2 sensor from bad valve seals, new aluminum heads are going to help. Compression should be in the neighbor of 9.3 to 1 so 87 pump gas should be fine according to the local engine gurus. The ProMaxx heads are a 72cc chamber with a 185 runner old stock heads were 76cc and 180 runner. This should give a very nice cruiser setup