aceca289, go to cobraautomotive.com they can help, also hipomustangs.com forum post on the restoration forum, also what is the casting number and date code of your block, it can be found behind the starter, also, there is a pad on the right rear of the block with a 4 digit number that indicates the production order of your hipo. if your date code is in fact 63, there are many important differences from a 64 hipo that you need to be aware of. timing cover oil fill, 5 bolt bellhousing, closed valve covers, closed chamber heads...check those numbers and get back to me...a great book for info is small block fords by bob mannel, he is always on the hipo site and will answer any questions.