Ya, disconnect the rad, and rinse it out (run the water backwards). Maybe even try using a solvent... just rince it out well so it doesn't get into the heater core!
THe exhaust isn't getting clogged is it? THat can really cause some heating. THe stock 4 cat H-pipe sucks... and it could be pretty much shot.
The Black tragic fan is only rated for the 225HP. Anymore (or A/C), and it won't cut it. An SN95 or Mark VIII fan is really the way to go. You'll need the 130 amp alt as well.
I wouldn't use the 160 thermostat, but I do highly recommend a hi-flow 180... it really does make a difference.
Stock pulleys overdrive the waterpump by 29%.
March underdrives the waterpump by 10%.
March underdrive crank & going back to the stock WP pulley will overdrive it by 6% (some help).
Since you've got the electric fan, you could even go to the 93 cobra over-drive WP pulley, which brings it back up to 29% (with the underdrive crank). Since the fan & clutch are gone, the waterpump should still last a long time.
If that doesn't work, at least get a 3 core rad!
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