I've only had 2 big block Chevys....both 496 13.5 :1 motors....well built. I'm using a BeeCool aluminum radiator with 1 large fan, and a CSR electric pump. If I make one quarter mile pass, I'm at or over 200. I'm running a 180 thermostat. Any solutions on how to keep the heat down? What temp. is the danger zone for these motors?...Gen VI block, Dart 335 CNC aluminum heads.