I don't understand why everyone insists on giving you bad info. It most certainly CAN be done with 8.5:1. You simply have to know how to do it and which parts to use. More importantly, which parts to AVOID. 350 plus HP is easily within reach of a low compression engine, with ZERO chance of having trouble with pump gas. It's simply not true that everything has to have 9.5 or more to make reasonable power.