I don't think the C6ME blocks are "garden variety". I think they have thicker cylinders than the typical 390.
[/quote]i think you are right.i have subscribed to many ford and muscle magazines over the years,in one of them i read that the 66-c6me block had thicker walls and that the c6me-a aint bad either,but i cant find the article and i got laughed at by many members who thought i must be crazy. i posted a topic on it when i first joined the forum,absolutely nobody agreed with me. i wish i could find the article.the guy who wrote it had blocks all over the floor,looked to be dozens,and it was an old mag from the late 80s-early 90s.back then i was so obsessed with fe engines i bought every mag-book i could find with fe fords in them