4-speed chatter problem

I have the standard BB clutch linkage (special z-bar and clutch adjustment rod). I've had 2 new pressure plates with the same results. I have not checked my pilot shaft. I'm not in any way leading Wayne, he is calling me practically daily leading me in directions he wants me to try. All the parts changed to this point has been on his suggestions. I feel at this point the checking of my bell housing run out and checking the pilot shaft is going to be good directions to go. The car ran fine as an automatic car. These issues came up after the 4-speed swap took place. I can't imagine having a crank problem.