Okay, another update... I'm probably driving everyone crazy with this..
After chatting with John last night, I finally found a picture on the web of where the casting numbers should be. They are supposed to be right where that ground down part of the head is in one my earlier posts on this. I contacted the guy that I bought the heads from, and asked him why there was no casting number, and this was his reply:
"We buy a lot of the 302 and 351W Ford heads from a supplier who gets them from a Ford authorized rebuilder. They are take off heads from the 1987 and newer engines. It is part of his deal with Ford that the numbers must be removed. I have never had a problem with that since we know which heads are the 1987 and newer by the valve size and combustion chamber size and design. He is an excellent source for us to get good take off heads for us to rebuild. I can assure you that they are correct as advertised. Let me know if that is a problem for you."
After discussing his reply with John, we agreed that it wouldn't hurt to take them to a shop that can tell me if these are E7TE heads somehow. Has anyone ever heard of anything like this?.