Ignition timing

I am about 19 initial with 35 total running a 383 on REC90. 906 heads with zero deck flat tops. Early 108 center 292/509 cam advanced 4 degrees. No ping or Detonation, quick fire and no buck. The vacuum advance Is blocked with a BB and just for looks. It goes full advance by 2K RPM. Dizzy is a point type lean burn unit and I welded slots after seeing near 58 total. Bad luck for me finding the lean burn unit on a reman buy from Rock Auto but it works just fine in the end! I also run the pertronix III and the accompanying coil.