I'm still running the stock radiator; it's never been removed from the car since it was installed at the factory 40 years ago. Try that with an aluminum one. My system is stock except for a better dual pusher fan set up. Never any overheating problems at all.
I'm meticulous about changing all fluids every year. My Brake Master Cylinder, Clutch Master Cylinder and Clutch Slave Cylinder all made it 39 years. I'm still running the original 40 year old Brake Calipers and Water Pump.
Change your fluids annually!!