Thanks F100, Vike, and 428. The casting number on the intake is C7AE-9425-F, so at least I know what that is. I'm still having a prob with the block ID. I found the casting number in the usual spot and all it says is C6AE- and no number after that. I just bought these two blocks, one with a crank one is complete. The guy I bought them from said they're both 390s but one is about 50 pounds heavier so i'm trying to absolutely ID them and the cranks. One block has no casting number and says 352 in a few spots, but I've been told that most FE's say that. I'll keep looking......starting to get a little frustrating