I have put the newer Trick Flow heads on my 72 Duster 340 and the Dougs headers bang the torsion bar on the drivers side, 3 tubes hits drivers side, 1 tube on the pass side hits the torsion bar, one tube hits the man steering box.I am not going to blame the headers just yet, I am calling Trick Flow in the morning and ask them if the head is slightly wider. That is what it could be short of the headers being screwed up. I have had to raise the motor about 1/2" on both side to get things where it is drivable .This is just a warning for people who are thinking about using these heads. Something is not the norm here. If I had known this before hand I would have bought cheaper headers the bend up. The good old after market.