200 degrees in traffic is not too hot for these cast engines. above 220 then you need to worry. The dummy light does not come on until 243 ish. First when it gets hot use a thermal temperature gun to check actual temperature. Check radiator neck hose on intake, check sensor on intake. Check the temps on the upper and lower hoses. If any of that is getting up around 220-230 then we need to start doing something.

Pontiac's used 195* stats, and normal temps where 210-215.
Some 220.