1964 Dart restoration start

A a few cheap fixes:
1) Before you fix the floorboard and carpeting, do the headliner first.... and get a wiper seal kit (http://www.engine-swaps.com/Pages/ProductsYear/63.66aBody.html) to lessen the amount of water that will leak in on your new installation.
2) Remove any stale gas if the car has been sitting. Take your time gently taking the engine out of hibernation. Take the carburetor apart and clean it.
3) If it has all drum brakes, they are marginal at best. At the very least buy new wheel cylinders (cheap), bend your own lines, and get a dual chamber master cylinder to replace the single one (go to rockauto and order one for a '68 model). Your car will be much safer.