I was able to replace the worn out body mount bushings on my 1971 with some new Energy Suspension bushings. What a difference! I found out that the rear two didn't even have bolts in them.... and the passenger front mount is torn off my inner fender and core support!
A bit of sage advise: The #3 mount that is beneath the front seats has a hole in the top of the frame that is the perfect size for the tube spacer to fall through. You will have to remove the rear bumper and use a shop vac to retrieve anything you drop inside the frame. I found this all out the hard way!