When was the last time this car was in running condition??
My car sat 15yrs.
It needed a fuel system rebuild/clean front to rear, starting with tank removal,etc,etc,etc. No fuel system part was immune.
If you have many issues: fuel system, fuel system electric/electronic, etc...A good choice is to remove all of it, and go with an su carb...or easier....a 4 barrel carb set up ( my personal suggestion). Very easy AND VERY reliable.
HOWEVER>>>>>structural rust should be your PRIMARY CONCERN. Don't spend money getting a car running that is too expensive to repair mechanically/structurally. For what you will pay someone to repair structural rust, you may be able to buy a much better car for less.
Ask members of the rotisserie club for input.