It would be a lot cheaper to buy a parts car (or several) if you have the room. It gets real expensive buying a car a piece at a time. Good news the 1964 has more restoration parts than any other full size this side of the fully reproduced TriFive Chevys.
You can find original metal parts that are rust free in the Mojave desert (California, Nevada), or the Sonora desert (Arizona, New Mexico) and the Chihuahua desert (west Texas). If you need interior parts look inside cow barns in Minnesota and Wisconsin, or farm equipment sheds in Ohio, Iowa, and Illinois.
If and when you finish your car(s) you can usually turn around and sell your stripped parts cars to another desparate person trying to restore his car project iin the future when there are even fewer parts cars available to mine. This is a very expensive hobby and many projects are abandoned because people run out of money before they get their car's finished. I suggest planing ahead and developing a spread sheet.