TorqStorm Supercharger build advice needed

All good points and things to think about. One caveat though. This will likely be a 200-230 hp engine on 6-8 psi. Heat is directly related to hp and load. He will be heavy with big tires but he does have steep gears. I think it could be done on a stock replacement type piston and 91 octane. Once again carefull tuning will be key.
Here's you a curve ball. What about this? Use manifold vacuum on the vacuum advance for the boost retard. Set timing with the vacuum can attached. That way, when vacuum drops off........OR when boost is present, timing falls off some. Cheap man's boost retard......but would it work?