Obviously if he doesnt know what physical parts he needs for a turbo engine how is he going to set up megasquirt??
And from my experience pulling 3 engines, buying/selling several wiring harnesses, and looking at the one on my 78, many wiring harnesses are very much usable for a "successful tradiational transplant." Things like the injector plugs, head temp sensor are all easily replaced, plus many of the other plugs are large enough that they usually arent broken.