I think there is gonna be a need for some pics, lol. Everybody on this site is very helpful. Ask questions, get answers, come back with replies on what you found out. The guys on here have helped me a whole lot. What exactly is interchangeable between 79-80? I know some Broncos in 80 had the same 351M as the Broncos in 78-79 did. Only b/c there were some 351M leftover that Ford wanted to use up if I am correct.