I have the 2.25" primary 4" collector TTI headers on mine. I had to dent one tube on the driver's side IIRC to clear one of the side main cap bolts. Had to clearance the passenger's side b/c it laid against the torsion bar. Not a big deal, but they fit great now, lol.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax