This is my 1971 El Camino after my engine swap. I this motor from a 350 from a 1976 Corvette and I put on a 3.75" stroke crank and bored it .030 over to make it a 383 stroker. I put on a Comp Cams Xtreme Energy XE268H cam, high energy pushrods, roller rockers with a 1.6:1 ratio and dual valve springs w/new retainers, locks, and valve stem seals. The cam with the higher ratio rockers is .508" lift intake and .510" lift ex. And open headers for now :).