The '63 and '64 Hood Hinge interchanges as mentioned, but the '64 Hinge was designed to be stronger. Now, this could have possibly changed mid year, not sure, but in my experience I have found that all the '64 Hinges are better than the '63's.
Another good alternative is to send an old set of '64 Hinges out to be rebuilt. A good rebuilder is Wilson's here in Virginia.