360 running hot…very hot

If you have any kind of Cam that's bigger than about .480/228 at .050 you're going to need initial timing that's about 18° or more..or it'll get hot at low speed/sub full advance.
so check your timing, reset it if you have to ...and take a test drive to see if it starts to get warm again at idle low RPM speeds. If the timing is good then look at the fan size.