Late to the party. I have a good friend that built a stroker 318 Poly. Came out close to 392 ci. He got some advice from Pavlovitch, a cam from Racer Brown and one of the new aluminum Poly intakes that came out several years ago. Over 450 ft/lbs on the dyno. It's in a heavy car, a 65 Coronet 500 convertible. Runs awesome.