i believe locking the dissy applies to both points and electronic systems, it involves welding the dissy so the timing is set at a fixed amount wether the car be at idle or full boost 6500rpm. This way your timing wont run away at full boost on you causing pinging and associated head gaskets and rings etc. Unfortunatelly i have never welded a dizzy the shop did mine as part of setting up the computer and tune, if someone had some pics that would be great.

With draw through i have found that the system works a lot better if the turbo is small enough that the impella wheel spins at idle, this way fuel dosnt tend to puddle in the compressor housing resulting in a rich stumble when you crack open the throttle after idling for a while. Also make sure the carby is verticle or slanding slightly down into the compressor inlet or fuel will puddle in the lowest point, mount the carby as close to the turbo as possible too. For a budget approach i reckon use the stocka inlet manifold make a flange for it and piping from compressor outlet to the flange were the original carby used to be. If you dont want to pay for a carbon seal a budget approach would be to remove the throttle from your carby and run a small throttle body mounted to your standard inlet manifold so there is no vaccum to suck out the oil from the seals, you cant run a choke either though. Might have to build a budget kit for my white sedan when i upgrade my turbo some day!