I just thought of something If Hemispherical Reproductions made your K frame out of a B-body core, your steering box sits at the wrong angle. B & E body k frames will physically bolt into either car and work with everything bone stock. But throw something like headers that might have a very close tolerance into the mix, and it could possibly cause the problems you are experiencing. In a B-body, the steering box points upwards to the rear at a greater angle than does an E-body steering box. I know it may sound like I'm taking up for TTI,which I'm not...I just wanted to give you more info that I thought of. Oh, and I'm 52...and know EXACTLY what you mean about headers back in the day! Good luck