Few things you might want to look at before springs. First, what condition are your bushings in? New poly bushings can tighten things up a lot. Second, what have you got for sway bars? If you haven't got one or have a small factory one, getting a large front and rear sway bar can make a drastic improvement in body roll. Third, what have you got for tires? 16"+ wheels and lower profile tires make a huge difference in handling. On my 84 I noticed almost as much difference when I went from 14" wheels to 16" wheels, as I did when I added a front sway bar. Never got a chance to lower it or add a rear sway bar, but that's coming on the next one.
I know that their were several different spring rates used on the 2wd I-beam Rangers, If you need springs maybe you could find some with a higher spring rate. IIRC NAPA lists spring rates on their replacement springs. Any stock replacement 2wd spring from 1983-1997 should fit right into your truck. I was actually thinking about doing this if I replace the springs on my 86, but I want to see how it runs and handles with just the lowering, sway bars, and larger wheels first.