Accourding to Comp Cams all of the cams with a -9 is billet stock and the -8 is a alloy(special material) and better heat treating for the higher spring pressuers and you can use the stock push rod and distributor drive gear. A search of that # you have came back with Comp Cams Chevy 262-400 Xtreme Energy XR258HR Cam pt# 8-408-8. I'm running the 8-422-8 and I'm using the the stock fuel pump rod and no problems. Is the block you have a factory hydrolic roller motor?