Header Help Please

With a leveled chassis,measure up from a level floor to bottom of where the the centerlink sits on the pins. Both sides should be the same. Perhaps you can lower the idler by filing out the lower slot.
Or grind off the extra threads on the pin. I did all of that, loctited the nut, and then clearanced the nut, and raised the engine, and they were TTIs.
Almost everybody has these same problems. One would think they are all using the same crappy jig.

What year Swinger. I think the 73up steering stuff, points the steering pins down. You need three pieces; pitman,idler and link. The rest is the same.