Dwayne Porter did a pretty straight forward 383 that made 500 hp. I have been able to duplicate it and it makes for a great 7.00/11.00 combo at #3400. However, I would that say that due to parts availability I'm not sure I would build another 383 but move in the direction that has already been mentioned- 400 based 4.375 bore/6.800 rod/offset ground 383 crank.
