I have a stock set of 346 Mopar heads. I'm wondering if the steel 346 heads with porting and the bigger valves can flow enough to keep up with a 510 CU IN with a healthy cam. Not sure on the cam specs yet, but it is going in my 21' mini cruiser jet. I took the block down to have it cleaned up and the machinist said it had .005 taper and recommends taking it .030 over. I'm thinking 11.5:1 or something close to that and run it on 91 octane. I'd go all out and do 14:1 on E85 but I'm not sure that would be as reliable for the family truckster, and I don't really want to have to go to dual carbs to keep it fed. Any thoughts on making more power from my mopar?