TorqStorm Supercharger build advice needed

Measure everything as you're taking it apart. Then you will know what to machine, and how much. Don't guess, measure.
Agreed. I'm not planning to guess. Just trying to determine what my end numbers should be and develop a plan to get there. As the father I'm expected to have all the answers (and I don't always!) so I'm trying to get ahead of the curve on this as I can.