You're on the right track (so to speak). See what the temp is during the next race with the B&M. Might even need a bigger cooler. Running 230-250 for 24 hours is asking for trouble.
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1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 56K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.