Back then, the 1bbl was the 'economy' version of the Ranger, used on the 2.0 version. It may have been used on the 2.3 as EFI was coming into use, but not for all states.
You can get a 2 barrel Holley/Weber that has a mechanical secondary, but may need to replace the intake manifold to match the bolt pattern. The 2bbl was used regularly in performance versions of the lima. You may find it searching for 'lima race parts' or a similar web phrase.
I think 85 was the first year for a 5-speed transmission. They allow you to have a slightly performance final drive without having the engine spinning huge rpms on the freeway. More acceleration and decent mileage at cruise... You would need to figure out a clutch mechanism as most are hydraulic vs cable operated.(I think).
If your 2.0 is kind of tired, a 2.3 or 2.5 should make a noticeable difference, though you would have to change ignition.. and a lot of other stuff depending on which you chose. I think a 2.5 crank & pistons can be fitted to the 2.3 block, and maybe a 2.0 can be bored to 2.3 piston diameter. I don't know if the blocks are the same, just the bore diameter being different.
tom