Radiator tips for 67 Dart with 440

I have a 430 hp 360, which I run at 207*F on purpose, with no problems.
I can tell you what is overkill, and it does NOT include a new rad, so long as water still runs thru yours.lol.
What is your definition of overheating?
Plus what does it do when it overheats?
and like @Murray asked, when and under what circumstances does it overheat?
What Idle timing are you running? with what cam-spec?
Do you have an Infra-Red heat gun?