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try putting a cap on the vacuum advance . put all of the timing in mechanically. It is a free suggestion. put a piece of duct tape on it for a test if it works spring for a fancy nipple cover.
I have a 470" b engine with a 22" radiator. no fan shroud, 5 blade clutch fan. 34 deg total all mech. vac advance plugged. runs 180-185 deg.



actually last time i was out, when it ran hot, i stopped at a park, and let it cool off. I always keep caps on exposed studs in the engine bay for when i'm checking timing, i disconnected the vac adv on the drive home, and capped the carb port, still the same, at the few lights i stopped at it crept and was still running like a$$....