The 2.3 came in so many different vehicles in the '80s...they were even used as industrial motors. The basic engine is going to be pretty much the same (short of the turbo version) for most applications, you might have to change intakes but that's easy. And don't limit yourself to the '80s in your search for one, they came out in 1974 and were used in quite a few vehicles in that decade. Here's a list (probably not complete, but close) of vehicles that came with that engine, some as the base model (like the Mustang, which of course also was offered with a V6 or V8.)

Aerostar
Courier
Pinto
Ford Ranger/Mazda B-Series
Mustang II ('74-'78)
Mustang (Fox body, '79-'93)
Fairmont
Mercury Bobcat
Mercury Capri
Mercury Zephyr

And I haven't even touched on the turbo version models here, which would require a bit more work to adapt (especially the EFI models.)