Welcome!
I'm surprised that no one has commented on the picture of the asses in your gallery.
x2 on the suggestions to start with your radiator. Shroud the front, and get a better shroud and fan for the rear. That will help a lot. You are getting nowhere near the cooling capacity of your radiator with that setup.
Nice looking car. Enjoy it while it's cooler.
edit:
It gets hot here in Dallas too, so we added hood louvers to help get the heat out of the engine compartment.
