Attn 351W guys

[Fox Body]

Well, that sounds correct.
You never actually said what type of radiator and thermostat you have. New, old, stock 5.0? Anyway, I would check out some decent 3 core radiators (some of which others posted in this string) and go with a 180 degree thermostat.
Note: if your radiator is broken, don't get it "fixed", get a new one. Also, make sure your timing is set correctly.
Hope this helps even if only a little.

“…because, no one’s really gonna be free until nerd persecution ends.” ---Revenge of the Nerds

-------------------------------
'79 Mustang Coup
4" Cowl
Weld wheels (15x6;15x8)
Stock 5.8L
C4 w/ shift kit
1.5" MAC full length headers
Holley 750 CFM
Edelbrock intake
2.5" Off road H-pipe
8.8" Rear end w/ 2.73:1 gears (sucks!) (awaiting installation of 3.55s)
Front: 225/60/15 Rear: 255/60/15 Eagle GT II
Sucky Purolator air filter that's choking my car.