Dougs
I wish that I'd seen this thread earlier. I had a similar situation with my son's Duster, but adifferent header brand (coated Hedman's). I solved the problem by using a left side motor mount pad from a D series truck (72-78). That pad is thicker and it raised the engine enough to give adequate clearance around the steering. works on 67-72 K members.
It's the engine compartment in my avatar.