Starting a BB Duster project

I put a new super stant thermostat in there and now it acts normal. The engine temp comes up to 180 and then hot water begins flowing to the radiator. When the thermostat opens up the engine temp wiggles a little bit and flattens out. So I think the old thermostat was stuck open even though it appeared to be fine. I tested the old thermostat after I pulled it out and it worked just fine. Maybe the spring was weak enough that the water pump forced it open or something. Weather forecast is solid rain for the next week so it will be a while before I test drive the car but it seems to be fixed.