The engine I was working with was fairly similar to what you have. It was 505 inches and 13:1 compression. It made 620 hp with the cross ram, 705 with the Indy X ram box intake and 740 with a 440-2 intake and a Dominator carb. I think we changed cams in there too. I was using a cam that is a little bigger than what you have. Here is a link to one of the articles. The MW article is also in the tech archives:
