Today my friend brought me to this guys house that has an 86, a 92( i believe), and a 69 mustang. We were going through his shop, guided tour of course and he had motors everywhere. long story short he said he had a 351 for sale for 200 bucks, i think i can talk him down to about 150. We looked all over to find out what it was out of. No numbers or anything on it except it said "7E9R" on the side of the block under the head. Anybody know what that means or what it could be out of? thanks in advance!