If your wanting to make big HP,750+, with a stock block the only one I would consider after having them sonic tested is the 400 blocks, doesn't matter much on which year or casting number to me as long as it sonics good twocents work scope wrench
Aluminum main caps and ARP main studs also up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)