Glen my money is on C5AZ, take off a carb and see if its a dual plane (C5AZ) or a single plane, with individual-runners. Two of my favorite books are High Performance Ford Engine Parts Interchange and Ford Performance from Cartech.
http://www.cartechbooks.com/
I'm sure some of the guys here in this forum might know some that might be better but I lucked into these visiting my local bookstore.