falcon_boy, sound similar to a problem that i had.
my temp would sit quite high during the day, and if i dare give it a bit, well i just dont want to go there.
First up i put in a really cool thermostat, and got rid of the clutch fan. this seemed to make quite a difference, it took alot more to get the car to get up on the temp gauge.
Then when my radiator side tank decided to split at 2am one Sunday morning, i was up for a new radiator. You can get one from the wreckers for about $200, but i wanted to go with a ford radiator. The 6cyl radiator is more expensive than the V8 one, yet the fins on the V8 one are closer together, (hence better cooling) than the 6cyl one.
Apart from that, the V8 one is EXACTLY the same, despite ppl from ford saying it would, then no it wont, and the price changing a million times.
My advice, if you go down the thermo conversion, you will need to get a cooler thermostat anyway, and put in thermos, and a new V8radiator. my radiator cost me $284, (thanks to my connections).. and this would be the same setup that i now have
My car sits on the bracket on the cold side, and barely moves in good traffic. my temp will rise if i am still and dont have the a/c on (the fans cycle with the a/c) but the thermos come into play, and cool the bastard down really quickly.
If you want any help, i am sure if you talk $$$ Rollin will help you out.
And if you want some thermos, i will be able to arrange some for you, exetremely cheap!!! i have a spare set, but they are already sold, but i am sure i mite be able to get another lot!!!