Is it worth the extra money for the 1067 head gaskets over the 1057. Only difference I could see is the 1057 is steel and the 1067 is stainless. Any other difference? I'm New to the Chevy stuff and only want to buy 1 time. I'll have a Dart block and either RHS or Trick Flow heads. Dart recommends the 1067. Whats everyone using 4.600 bore 632 pump gas motor.