Curly, are you running a radiator because you burn gas, or drive your racecar back from the track to your pit ?
If you are burning alky, your car will run faster if your motor is hot, 180° to 200° if you still run water, or 150-170° if dry.
If you are running fuel injection, lean your barrel valve to build more heat.
I run water just in my iron heads and iron block in my alky JFueler [ no pump or radiator] , running 7.00's @188 mph with 16;1 compression with no head gasket issues since I started running Cometic 3 pc gaskets.
If you are not sure if your motor is running too hot, next time you pull your heads off, look for black spots on your cylinder walls, if you have black marks, that is where is was red at onetime.
Good Luck, have Fun !
Jon