i am just about done building my 572ci Indy Maxx motor for my 63 Dart...the headers are going to be custom built and need to know what you guys think about header tube size..i have a set of 440-1(345cc)CNC'd,747/765 roller cam,14.0CR,single 1250 Dominator for now but will be installing my Tunnelram later..i didnt know if 2 1/8" is going to be enough tube or if i need to go to the 2 1/4" ??? Oh, before i forget, when i do upgrade the motor in a few seasons, i will be boring the motor to 4.5" and making 604ci at that point.. spending 1500 on a set of custom headers is something i really only want to do once..so if i go with the 2 1/4 tube now is that going to hurt me?? what are you guys using ???