According to SA Design’s Ford Parts Interchange book there are F4-F7TE engine blocks. From my experience on the blocks they change the stamp on the side every year. I have had a lot of Ford’s with a lot of different style’s and years of engine’s, and in every case the stamp on the side was more a date code than anything. Perfect example. My uncle has several old FE engines laying around. 2 are stamped C6ME-AA, yet 1 is a 360 and 1 is a 390, but both came out of a 66 vehicle. I guess since it’s technically the same block is why the code is the same, even though everything inside the 2 are totally different. The only way to tell what you have with those engines is to take something and stick it in one of the cylinders, bring the piston to the top, mark your “stick”, then take the piston to the bottom, and mark your “stick”. Based on the travel distance that will tell you 360 or 390. He Also has a ‘68 390 stamped C8ME-AA. It’s identical inside and out to the C6ME 390, same internal parts and everything, but the code changed because the year it was cast changed. So a 94 351 Windsor, maybe late 93’s, would be stamped F4TE for 1994 truck engine. According to Ford’s stamp coding and my parts interchange book, a 1995 351 would be a F5TE, a 1996 stamped F6TE, and so on.