Cooling issue

[PNJSNAK]

Now that the temp in NE Ohio is below freezing????
I thought I would put it out there about an overheating issue I have had since I built the car in 2001 (finally)!
No matter what time of the year, spring, summer or fall.
After driving for 15 to 20 minutes the water temp goes over 210degrees F.
I have a 180 degree thermo in a 351 Winsor approx 350 HP, cast iron heads.
I have run the engine until the thermo opens to get what air I think is in the engine out. I run 50/50 water and antifreeze. I run the overflow to a catch can and the overflow of tha catch can runs to the ground area.
If I open the heater valve then close tithe temp goes down to 200 but soon goes back up. I get concerned that the temp can go up to 220 in the summer.

I am tired of being concerned and am looking for some help solving this issue when the weather warms up in the spring.

Any suggestions would be appreciated.

Is there a cooling specialist in NE Ohio?

Jim