I’m in agreement with oldskool and bluebird428 on the thermostat temp. I always use a 160 degree thermostat and like the temp under 180. My current engine is a .030 over 400 with TRWs replacement for factory flat tops, mild street/strip cam and 670 heads. Of course I have to mix my fuel at that compression but I have no overheating problem. I run a stock distributor (vacuum adv hose to manifold) and stock solid HO fan and shroud (which moves a ton of air) with the correct factory fan spacer behind a factory 3 core rad. The engine runs very strong if it has enough advance. If the temp gets much past 180 I can’t run the advance it needs to run it’s best.
Granted it’s a 4 spd car with no air, but I don’t know why so many feel you need the high temp like a SBC. All my many Pontiac engines over the years from PHX to Sacramento have been happy with 160 thermos. Only exception was when something was wrong like the plate or seals in the water pump being corroded.