The shaft out of the billet distributor fit in the stock one, although I had to use three shims to get the end play down. I set it to 28* at 3200 rpm and got the 16* at idle I had before. It was the reluctor stator assembly sliding up over the round snap ring in my billet distributor that was causing the timing change, the stock ones use a flat snap ring.

Now I have four modules and three coils. Performance coils can supply high voltage at a much higher rpm than the old stock ones but should have a matching module to operate correctly. After seeing the innards of my so called performance distributor become dislodged, I suspect the coil is of the same low quality. Any suggestions on a good quality performance set?