The '85 Celica is a simpler car to work on - mainly by virtue of RWD and North-South engines not having every mechanical item in the car crammed into that same engine bay.
But the parts availability is drying up
and age (rust, etc) is never kind.
The '90 corolla is still okay for parts and I believe it can interchange many parts with later models (engine upgrades anyone?)
The 22R came in both EFI and carb versions.
The '82 Celica is essentially the same as the '85 but has carbs.
But EFI isn't so hard to work on once you get used to it.
Don't forget that RWD cars are so much more rewarding to drive than FWD.
If the '85 Celica is too hard to find parts for, consider either a late 80's/early 90's Supra or a similar year Cressida.
Think of them as 6 cylinder Celicas.
My wife's '87 Cressida (2.8 litres) easily keeps up with the latest 4 litre cars.
The Corolla makes more economic sense.
I'm happy quite with my 77 Celica liftback but I don't mind scavenger hunts in wrecking yards and the occasional roadside repair to failing mechanicals.
Follow your heart because your wallet takes you to places you didn't really want to go to.
- Stepho
http://ourworld.compuserve.com/homepages/stepho/celprod.htm#cel64pr