Whether an aluminum or stock radiator, you will need a good electric fan(s) or a mechanical fan running off of the water pump with a 360 deg. fan shroud. I have a Griffin aluminum radiator running a mechanical fan and Impala fan shroud on my '62 383 stroker. Idling for a long time in 95 degree weather, never gets above 195 deg. Mostly runs about 185 deg. daily driver.
