Car won't start after sitting for a few years

I would replace the distributor pick up coil.

I would check the seal around the distributor cap as one of the 3 screws are broken most of the time

If you put battery voltage to the starter solenoid &
it works & the starter works,then the solenoid control
circuit has issues

Fuse,ignition switch,neutral safety switch,clutch sw
& such, depending on what the car has

You could try switching relays but doubt that is an issue

need to check the charging system..when a car sits for a long time the battery should be disconnected or compl,etely removed..sounds like operating voltage is too low check the alternator for stuck brushes or malfunctioning regulator..should show around 14.5 -16 volts..

did you give it a tune up change plugs fuel filter

CLEAN & DRY ALL PARTS CHECK FUEL IS GOOD,ONLY IF YOU KNOW WHAT YOU ARE DOING PLACCE SOME FUEL IN CARB ,CLEAN & CHECK PLUG GAPS,A CAR STANDING WILL LOOSE THE PETROL ORIGINAL STRRNGTH

the fuel will be contaminated try putting some fresh in the carb clean all the ignition electrics just cause its turning does not mean it will fire,clean the plugs remove air filter,(just till the car starts) then replace service the car its a must

Drop the tank remove all fuel replace the filter and fill with fresh gas

Are you check starter or ignition switch?

Safer is to use 'carburetor cleaner' which is also flammable but a little less dangerous than using gasoline.After sitting a long time, our modern gasoline gets tired; never allow something to sit so long without adding some 'fuel stabilizer.'If possible with your car, I would drain (siphon) the tired gas out and replace it with a few gallons of fresh.
Really tough starting problems can also be overcome with 'starting fluid' which is pure ether and very flammable.Any of these may require the removal of the engine air filter so the liquid gets into the intake manifold.
Stale gasoline can also gum up the fuel injectors which may have to be removed for service if none of the fluids causes the engine to fire.