[Woodz428]

Well you DO have a 351C, because the intake you mentioned only works on a Cleveland, not a 351M or 400. A 2V intake can be used on 4V heads, but isn't as effective. You can tell what heads you have by looking at the upper corner and see the number there. Unless some 351M or 400 heads have been used( they fit) it should have either a 2 or 4 for the kind of head it is.Someone familiar with the engine can also look at the exhaust flange and see the differences that would distinguish the 2. If there is no 2 or 4 in the upper corner of the head,by the intake and above the valve cover, it would be safe to assume they are later heads and only the 2v type.