Late to the conversation here, but get an oil cooler with fan. There are quite a few threads where the engine is within range but the oil temps are pushing 260+. You will probably stand to benefit with a larger radiator especially in short course racing or a lot of rocks where your working the tires a lot with throttle but getting very little air flow through the radiator. Try an oil cooler like cbr, and find somewhere to play at race conditions including rocks to see if that helps with heat before getting a bigger radiator and moving it to the rear.
Someone mentioned e85 for power. I just had a 416ci built on e85. It makes more power, allows higher compression (mine 13.4), bigger injectors, up to 30% higher consumption, but it runs cooler without the carbon build up.
Also benefit to cool the trans with fan type cooler as well.
Are you looking for a seat in the main event or looking to drive? I've got a chassis with gear works 10", 630hp motor above, 4l80, looking at a hero to run in low range that I need to nut and do something about on 40" treps. It's just money....sigh.