electronic ignition want to convert

Pertronix is easiest, but get the Ignitor II (~$110) or III (~$130). Your existing points distributor must be tight. If not, better to get a later electronic distributor and wire an external 8-pin HEI module + GM coil (from 85-95 GM V-8 truck, ample at junkyards). TrailBeast here sells a kit of new parts ($199). Many posts, so start reading.