Tell us about your water temperature gauge. OEM sender installed in the engine block to an OEM gauge, or?????
do you own an infrared heat gun?
do you know if your fans are wired off of one fuse or two fuses?? Should be two
if everything is operating correctly you should be able to park in the shade on a 100° plus day and let it idle for 15 minutes without overheating.
For reference I have a newly installed 404 stroked Cleveland with a Ron Davis radiator sourced from Dennis Quella. I suspect it is likely what you have installed in your car.
Steps taken with my cooling system:
OEM coolant design with SS tubing, aluminum heads, Edelbrock water pump, overdrive water pump pulley, 180° Tim Meyer thermostat with OEM brass restrictor plate and 16 psi radiator cap.
last week I parked outdoors in the shade with ambient air temperature of 103° I let the car idle for 15 minutes. It never got above 200°
204° during highway cruising is not an alarming temperature at all, but I do think it is higher than what many owners experience.
please go back and read my earlier post and provide answers to the questions I posed. Without you providing those answers you will not be able to receive well-informed responses.
Larry