I think there is a b body k on my 70 e body. My center link was no where near level. It rubbed on the oilpan and the left torsion bar. Had the worst bump steer I have ever experienced. Shimmed the box until the centerlink was level and all is well.
Considering that both the steering box and the idler arm and both bolted to the K frame how could the issue of it being an E body or a B body K frame matter?
If either the steering box or the idler arm was bolted to the unibody frame while the other was on the K that MIGHT be an issue , but not when both are bolted to the same part. Either the steering box mount was welded on wrong or the bend in the idler arm was wrong.