1990 Camaro Overheating

I have a 1990 Camaro with a 305. It runs fine on the highway but in city driving it overheats. I have changed out my thermostat, fan, radiator, and water pump. I don't know what else it could be. Also, I put my fan to run constantly. Any suggestions? thanks.

Is the air dam missing? Sounds like it.

Does it have an underdrive crank pulley on it?

Is the air dam missing? Sounds like it.
No, I have got the dam from asalvage yard. same problem

What is the temp when you say it's overheating?

Check in between the radiator and A/C condensor for pile up leaves, debris that loves to accumulate there. Any performace issues?