[biggbabysweetz1]

lots of things can cause this, first you may want to try the cheaper route and pressure wash your radiator and oil cooler (if equipped)
i have an 89 with the 350 and it liked to overheat cause the factory oil cooler would plug up with bugs and junk

also you may try a cooler thermostat. im guessing your running the standard 195 stat, try runnin a 180 or a 160 if you can find one.