Stock lower end so i figured i'd be nice to it, 500 will be plenty for a 2900 pound street car...for now. I have a 360 block waiting but money is tight and i figured i'd get the bugs worked out first, new to boost don't need to scatter a good block. I want the twins for the cool factor nothing else, i'm doing a twin carb draw through. I already have 2 complete turbo units from a couple old Buicks to get the carb manifolds(liquid cooled). Blow through is not an option please don't beat that Horse