HOT weather A/C and high miles

With a good radiator and electric fan, you should not have any problems. You'll need a 130 amp 3G or better alternator to keep up with the electrical load from the electric fan and blower fan.

I agree with Joe.

I also feel ya about not wanting to increase operating temps because of the extra heat rejection requirements. In considering coolant temps with regard to engine wear, ~ 190-210*F is pretty optimal. I would really not worry about it if your car (as is) runs at ~ 190* in your hottest ambient temps.

You'll probably want a decent sized trans cooler (if you dont already have one), so consider the extra heat rejection required for that as well.

Good luck with it James.