On a street/strip 440 A body, is there a big gain to be had going from the 1 3/4" TTI headers to the 2" TTI headers? My combo is a .030 over 440, Stage 6 heads ( ported, non- max wedge ), .588 lift Comp solid roller, Harland Sharp 1.5 rockers, M1 single plane, HP950 carb, 727, converter to be named later, 4.10 rear in an all-steel ( except for the glass hood ) 68 Dart. Just curious to see what you guys say. Does anyone have a header / engine sim program to run it through?