When you do this conversion with one of the Autolite Y-block distributors, it takes one fancy machine shop part and a Duraspark II donor. The upper rotor shaft of the Y distributor has to be turned down to remove the point cam and sized to suit the Duraspark reluctor / armature (8 bladed trigger rotor). The cam is hardened so I usually grind it off (carefully) before I give it to the machinist. The Y distributor is then assembled with the Duraspark stator plate instead of the old point plate over the modified upper rotor.
Send me a PM with return email address and I'll forward a PDF drawing file that details the modified part for your machinist to use.
