I would have to disagree that enabling timing control eliminates most issues. Timing control is at minimum, equally problematic, and susceptible to issues. And using an oe distributor just contributes to the problems. In my very simplistic opinion, stock distributors simply weren't what these efi units were designed for. The msd units are also plastic on the base for a SB, vs mine are all billet. RFI Can also come from anywhere. Poor plug wires, poor coil, poor wire routing. No doubt that 1000 get installed successfully, but the 10 that have issues post online. (No necessarily complaining or slinging mud, but still in the public eye of google) these tbi systems can refract rfi off the air cleaner base....off the hood, and I have personally even see engines die with the water temp sensor wire being too close to the ecu. The non timing control setup in my opinion is much less finicky. Buy if you want timing control especially, a stock distributor isn't where I would start. To answer the lockout question, the BluePrint distributors have an included lockout without any extra pieces needed. Just the passable rotor, which we also sell. Any replacement parts are all msd compatible. Also.