You are talking about a 351 Windsor correct? Ford made three different 351's, The Windsor (smallblock), the Cleveland (kinda a smallblock) and the Modified (bigblock). The windsor is the big brother to the 302 and I assume this is the motor you are referring to. Now to answer your question. I thought about it, but the windsor is not only taller it is also wider than the 302. It will fit, but not like a 302. You will most likely need at least a 2" body lift to help the hood clear the intake. The next problem appears when you realize that by dooing a body lift you raise the inner fenders up, this will create a clearance problem with the cylinder heads. There are several other items I have overlooked, but in order to run a windsor it will require alot more work than converting to a 302. Determining if the extra work is worth it is up to you, but be prepared.