Idler Arm hitting exhaust?

Hey **** HAPPENS !! Maybe your torsion bars are weak, maybe they were backed down to lower the stance. Could be the wrong exhaust system. Just a couple ideas.
Soft suspension would not allow the header to hit the drag link, they are both fixed. There are all kinds of tolerances stacked up on a Mopars unibody. Remove the zerk fitting ding it and weld up the header pipe. Also get the proper drag link if its not the correct year. 'Quick Steer' brand K7086 (Moog part too) : see how the top is flush and the bar attaches to the bottom? specs to 73-74 Duster 318. $6 on Rock...Bingo.

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