Unless there are issues with the engine it looks to be a pretty good street setup. Unless you want more power I'd leave it alone.
You have good shocks and a rear bar so a set of larger torsion bars and bigger front bar will go a long way to help handling if the rest of the suspension is sound, if not rebuild it and possibly get some aftermarket upper A-arms or use the Moog offset bushing (search this for the proper way to install them) for more caster. Brake wise I see you have front disks, is this converted to large bolt pattern 5x4.5"? What tires? The go a along way for handling and an alignment for modern tires.
