64 valiant wagon with push button auto trans

How many years has it been since it last ran. Did it run good. How do u know it’s the fuel pump and not clogged up lines or carburetor. When gas sits it gets nasty. Just trying to help u out. A non running car may only be worth 1/2 of a running driving car. I have bought old mom and pops cars and grandma’s cars that turned out to be far more work and expense than I anticipated. It is a nice car for sure. Kin