If you are looking into new heads look at the new AFR ovals. Either the 265 or the 290. The 265 will equal or outflow the small Pro One up to .65 lift in both exhaust and intake. Now remember the pro one has a 310 runner and the Afr has a 265 runner. You will get much more velocity out the the AFR and be able to make for power. In addition the AFR is less money. Or you can spend the same amount and get the AFR 290 which will blow the Dart away and again you're still running a smaller runner. IMO run the smallest runner you can that will meet your goals!