Cams for 318's

For what it's worth, i got a 72 Demon this summer. It has a mild built 318 consisting of stock bottom end and cylinder heads. It has headers, duel exhaust, and edelbrock performer package. This is the performer manifold (not rpm air gap) 600 cfm. carb. jetted of economy (1406) and their small performer cam, like 204* duration and .420 ish. lift. Car ran best of 15.4 seconds at Earlville this summer with 904 trans. and 2.76 open diff. a very nice running streeter. 17-18 mpg. But boy is that going to change!!