Pertronix rtr distributor vs. ignitor III

You didn't mention your engine and year. For anything but a slant, you can get a "ready-to-run" HEI distributor for $45 - $80 on ebay. However since you have an e-distributor, wiring an 8-pin GM HEI module & coil is simple and cheap. Any junkyard should have 85-95 GM V-8's. You need junkyard first to get the cables and connectors. A new spare module is then $15. Don't know much about rev limiters, but understand there many just attach to the coil.