need radiator recomendations for S/C and A/C

with the higer temps my car is running hotter. I won't let it get any higher than 210* before i shut down the a/c. Has shroud, clutch fan and wind deflector intact (but not in the best condition). Recently replaced the t-stadt with an unbalanced 180* (working properly). I've flushed the system a couple times but the previous owner said he upgraded the rad in '91 with a BBK 3 core. I truley believe the radiator has outlived its life and needs to be replaced. Temps seem to settle about 192* at idle w/o a/c. Does ok on the highway w/ a/c on but temps rise when under load and takes a long time to come down after shutting a/c off even while moving. Any suggestions?

Thanks, Dan