[flwolfman]

I would think that it would be a 351M (modified) or possibly a 400. They use the Cleveland head and are in that same family of engines. They are VERY common at any boneyard as most Ford trucks of the later 70's and early 80's used that engine along with most Broncos. These engine are inexpensive and not rare like the Clevelands, so good luck with your search. Jim