Ok. Im doing a new motor this summer. basic 383. Have heads and a block at a buddies place that i can use. This motor was together and running 1 year ago, but got dismantled when the truck was junked. So Im pretty sure the parts are all good. I need to know where to look on the block and the heads to find all the casting #'s so I can get the info on these things. I'll be ovr there tomorrow to get the #'s, so where do I look? Also, if you could point me towards and sites on the net to look the #'s up once i get them, it would be mighty helpful. Thanks.