I hope to replace the mounts on mine this winter and determine for certain how much of a difference the mounts make. It will be a pain, as the subframe connectors are welded to the belly pan and brace, so I cannot pull down the rear of the subframe. I may end up putting solid mounts in back if I cannot gain clearance for the bushings. Even replacing the front and center bushings promises to be a challenge on the '69.