I’ll answer these separately;
1. Absolutely, gapping the rings for boost just adds a few extra thou of gap for heat. The engine will not run any different or have any more measurable blowby at 030 gap than 022.
2. Anything you do to make more power NA will make more power with boost. This includes adding stroke. Look up and watch a bunch of Richard Holdeners videos on you tube.
3. Depends on what fuel you are willing to run. 91 octane, e85, or methanol will all require vastly different compression ratios and different tunes. The first thing you should do before turning a wrench is pick your fuel, and that will dictate your compression ratio. There is no “optimal” compression ratio.
