My cooling system sucks for Phoenix!!! What should I use?

have you thought about the chance of a leaking head gasket?

just the alternator might help too..pick up the voltage to the fan you have.. might not be working at full capacity..

The Mark VIII is a fairly large fan. This is the only link in my favorites I could find to one. Its based on instaling one in an '88 GT.

I dont know what your engine mods are, but I had bad cooling problems with my moderately modded 289 in a '65. I used a shroud, high-efficiency 3-row brass(from NPD I think), 180 'stat and a 6-blade flex fan. Before it would boil over in 90-100* weather and after the above parts I could watch the thermostat cycle on the gage.