68 Dodge Dart with 440 Cooling recommendation

I was having cooling issues with my 408 ci Dart with an aluminum radiator (22 inch), a 7 blade clutch fan, and a Flowkooler high volume billet water pump and a 180* thermostat. I ended up getting a Milodon balanced high flow thermostat and that took care of all my issues.

What can happen if you don't have a thermostat specifically for a high volume water pump is it actually won't allow the thermostat to open like it should all the time because the volume/pressure of water from the high volume water pump. I put a 160* in mine and let my Dart run for an hour idling in the driveway and it never got over 160* so it was the best 28 dollars I could have spent vs the cheapie 10 dollar "high flow" pos that I originally had in there.