We ran Auto lite 74s in both the 915 and the Max wedge heads. We did use a 150 shot on my buddies 440 with 915s and using the 74s.. I think that they changed the number on it but they can cross it for ya.. oh his is a 496... 12.5 comp soild mop cam 590 lift single carb 1050 dom. Hope this helps ya.