[Racer_X]

Welcome to the board, SnakeWench! There's a Houston Cobra Club on yahoo groups you ought to sign up on also. They usually meet once a month for a get together (just met yesterday) and do some fun events together. Usually have a lunch meeting in different spots around town to hopefully make it somewhat convenient.
The heat can be murder down here as you well know. might check the thermostat, make sure the water isn't flowing too fast thru the radiator (doesn't have a chance to cool off), try adding some water wetter for heat conductivity increase. A fellow Houston Cobra Club member James Yale has a shop in Tomball and specializes in the Backdraft Cobras, but they are all the same under the hood.

I'll second making sure the front area is sealed to force the cooler air thru the rad. What temp thermostat is in the engine? a single 16" fan might be too small for our climate.