Need more details. Carb'd or EFI, age and type of coolant pump, type of radiator, etc.
EFI tends to run cooler so those engines can run a 190°F-195°F t-stat and be fine. Carb'd I think the warmest that I'd run would be a 180°F, but I sure wouldn't go any colder than a 160°F.
The high flow...