if its sat for 31 years you can add suspension bushings to your list.
its likely that car has front and rear sway bars - bushings will be shot too.
probably the shocks. you can do all that after it is proven to run.
it might still have original clutch, or might have a replacement clutch of original type with rubber core given how long ago it was parked. if so you will drive about 3 miles before the core implodes. rubber will have disintegrated with age.
entire fuel system of hoses etc will be shot.
a lot of vacuum lines will have gone hard, maybe not all.
throttle body gasket will have gone hard.
injectors will be gone. you struggle to find original injectors.
guys here know what to sub and where from for a 1.8.
fuel pump - will bleed profusely if it even activates.
all that comes after what sir andy says about taking care before turning the motor over. depending on what climate/humidity the engine might be fine inside. you never know. a/c vw engines down here in aus, parked up dry, last forever.
as others advise re L jet fitted to 1.8s, it is a simpler system that D Jet and not too hard to get to the bottom of.
ECU or brain is military spec stuff - overengineered german conservatism. takes a lot to kill one of those off. should be ok unless its been submerged in water or been in a tropical jungle.
and you can slightly hot rod a 1.8 to make it breath better as i have discovered from guys here who do it. very subtle mods to the throttle body. brilliant stuff and probably better than carbs to make it brighter.
----------
as an aside - an interesting piece of evidence lying around for mr b (
@JeffBowlsby ) to see in the images. namely the charcoal cannister plumbing for a 1.8.
the can looks like its lying loose in the engine when it should be fixed on to a clip or mounting near the ECU or battery tray. but its there.