Depends how much power you want ?, a cheap mod for is the usual carb/cam/exhaust swap, if needing it a rebore to +90 with V6 pistons gets you close to 2100cc, and a big improvement, ported heads work very well on these,(start with injection head).
I had a 2.1 pinto in my sierra auto, with 32/26, modded head by the nutty professor, ie ROLAND HAYES(HT Racing), got 40mpg and it would eat my xr4i for breakfast.
tabetha