Are you staying with the same master? If you changing the master to something from a 2 chamber late-A body. I don't think that pushrod will work. On my 65 I used a 73 A-Body manual break master with the pushrod that goes with the 72 set up. Hope that helps...
Thanks, after a lot of persuasion , I was able to get it loose from the old MC, & yes I am using the new setup! I didn't want to spring for a new adjustable pushrod is there a source for replacement originals?