[ZeGermanHam]

I'm not quite sure how/why spindles entered this discussion. Can they affect the positioning of the center link? I thought the center link was positioned solely by the pitman arm (via the placement of the steering box) and the idler arm.

If it were my car, if I couldn't get more clearance by loosening and repositioning the steering box and idler arm, I'd buy the engine mount shims sold though Ames. I wouldn't want to bother with drilling out holes in the frame or relying on a weld to provide spacing. Just get the shims... It's what they designed for, and are an easy install.

Also, my deep suspicion here is not that this is a result of an incorrect oil pan, or collision damage, or spindles, or control arms, but rather it's likely the case that the aftermarket motor mounts are not quite as tall as they need to be.