Steering trouble wrong parts

It would be helpful if you show us what you have. Since 72 is not spool mount you may have motor mount troubles, IE wrong biscuits etc. What headers?

So far as "wrong linkage"

The "wrong linkage" won't even bolt up, the trick is this:

The steering box whether large or small spline determines which pitman arm you use

The pitman, idler, and center link must all "go together." Example, my 67 has had both early and late linkage, as I'm now running a later K member. But I COULD be running "early" linkage if I had a small spline steering box, which I DID have.

To put this another way, the early / late linkage has nothing to do with the year of the car. It is determined by whether you have a large or small spline steering box.

Here read this

http://www.forabodiesonly.com/mopar/showthread.php?t=236925