Steering All Over the Place at 55mph+

Oldmanmopar said

Buy a 68-72 K-member and get rid of that unsafe 67 Idler arm. Grab a PST rubber style rebuild kit for 68-72 year . You will need to use a 73 and newer upper ball joints, Your car has 73 a-body upper control arms unless they used adapters on the early style small ball joints. E-body and B-body will not fit the car. Who knows maybe they didn't use the adapters and the ball joints are wobbling it the spindles. Needless to say I would fix it before you crash it.

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Thanks OldManMopar. They are definitely the 73+ ball joints as I put them in myself. Originally I ordered them for a 67 and that's when I discovered the suspension was something newer and found the 73 e body ball joints fit. This is probably for another thread, but if it was originally a slant six car would they have had to put a new k member in to accommodate the 340? If so would that require a new steering system? Any way to tell the 67 idler arm vs 68/69 and would it fit right up? My apologies as I'm not a pro at this like y'all on the thread! I enjoy doing the work but have more questions than answers and genuinely appreciate everyone taking time to explain these things to me!