I didn't read through all the posts so hope this still helps. I have a 73 Scamp with Manuel steering and brakes as you have and have QA1 suspension that I'm using torsion bars and running TTI headers and no problem with the K member bolting up or anything for that matter.
Had to shim the motor mount on the left and ding the header a bit to clear the steering box but I like it better than the stock set up.
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