Here's a pic of the K-member. The 2 brackets sticking out of the front of it are for the sway bar.
The headers are close to the mounting hole for the lower control arms so the arms won't even go on at all.

I talked to Sam at TTI, he actually suggested the 62-65 B-body Hemi headers(#625-218), he said those fit best with the power rack steering.
I'm gonna buy them in raw form , that way if they don't fit I can return them. He said if I buy them coated they'll get scratched up with the fitting and shipping. I'll remove my K-member so the headers won't get beat up during fitment. If they fit I'll take them to get ceramic coated.

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1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual