1) At LEAST 30
2) 85 Ft/lbs for studs, and use moly for lube. It comes in the box with the studs.
3) No, you have to bore your motor at least 20 thou over to use any of those. They don't come in the stock bore IIRC. Rods should be fine.
4) Everything. Oil pump, water pump, t-stat, all gaskets...