Still overheating

Evans coolant. Ill check into that. I really hate to cut holes into the shroud. It seems to be doing the same thing it was before the radiator change. I had a radiator out of a international truck, big and ugly. I hate to wrap the headers, But I think that's where the problem lies. I bought fender well headers, but can't bring myself to install them (ugly). I read once to remove the thermostat, and put a washer in it's place. I have no heater. No need with these headers. A 13 mile trip brought the temp to 220 at 55mph yesterday. I have some Wynns water treatment I'm going to put in.

Either cut holes in the plate or build a stand-off frame that will move the plate about 1" from the face of the radiator fins. The frame should be a simple rectangular piece that keeps all of the air that goes thru the radiator inside the shroud plenum so that the fans pull all the air thru all the fins. Yes, check the air flow from the fans! I've seen them blowing forward instead of sucking air thru the radiator. Keep the thermostat. Add the spring in lower hose.

After doing this, then road test it and see if you need more remedies.