Thinking about doing this also. What mod s have you done?
So I first started with cooling, I got the flexalite dual electric fans which work wonders, plus a navigator fuel pump, also a bigger heat exchanger. It was about 86 out there but running full tilt the engine never broke 200 temp wise. Even then that was running at 130 mph on the straight.
Best upgrades by far for handling were the hellwig swaybar for the rear, stifflers x-brace, broncobeater panhard bar, and a rear spyder brace made by broncobeater as well. Since it was a 99 I upgraded to the bilstein shocks which did wonders in handling! I also put polyurethane bushings in for the controls arms but for how little they noticably helped it wasn't worth the struggle. Also I have a bumpsteer kit from LFP which was really helpful when merging onto the oval portion of the track.
Brake wise I bought some EBC yellowstuff pads and man do the STOP!! Kinda pricey but they really did wonders. I'd suggest setting up a cooling duct system for the breaks too, you could live without it but it sure did help when I needed to go from 110 to about 30 mph haha
Also I got a TA diff cover for extra diff fluid to keep the rear end cool.
The trucks has a few power adders but for this I don't think it really needed them, its damn fast on the track though compared to the other cars.