Simply replace it with a newer (firecore,petronics,FBO)dist that has no slop and a easier to set adv curve. I used one from FBO on my sixpack stroker and they set up the mec and vac adv to your combo (yes its a NEW dist NOT made by MP ) checked for out of phase on there dist machine. I just droped it in and set the total timing. It has a perfect curve and vac adv for my combo .