I ran a 12.07@ 121.75, 1.99 60ft. 3700lbs. Really wish I had some slicks. I have CNC'd 6.1 heads with 2.10 intakes. I would skip the 5.7 heads unless they are Eagles and are worked on. The capability of the heads is the main reason I did a Gen III to begin with. Dont mess with the older 5.7 heads, waste of money when if you keep your ear to the ground, Eagles, Apaches and 6.1's are ready for the stealing. 6.1's seem to be thrown to the side these days but if you find a good used set, you start with 2.08" hollow stem intakes and 1.62 hollow exhausts. [ Moparts Family Site - Keep it Friendly ] is not to like there?