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I agree...200 won't hurt anything...its the running rough that is a puzzle...I wouldn't think 200 deg would cause the car to run rough. I have been at 200 idling through a parade inthe middle of July but it never ran rough. I'd get rid of that AFB first and try a Holley. I had an Eddy AFB on mine and it had hot start issues.




Borrow a holley and a plastic carb spacer. You did not say what sort of fuel pump you are using but if stock mechanical I'd lose that too for an electric fuel pump and carefully re-route the fuel line or insulate it away from the heat, and try that.
You might also consider getting your stock rad recored to one that uses larger tubes, or a 3/4 row setup. Next step is an aluminum rad.