In addition to Beatcad's recommendations the concerning the lower sheet metal, you should also be aware that '63-'64 was a transition period for GM, although Chevy's are the least problematic. I don't know what kind of resources you have, so I can't say whether or not you should take on some old front mount(probably not)Saginaw rust bucket, just be aware you'll probably end up spending at least as much on suspension pieces and brakes, not to mention pipes, as you did for the car. A lot of rebuild kits and single parts are no longer around for these things, so unless you know people in the business, you'll end up buying complete wheel cylinders, fuel pump, and other similar items.