[Dpc2u]

Wow, so sorry to hear this. I cringed while reading your tale of whoa. As to why it happened you are dealing with a whole host of unknowns. How hard was the car beat during the 20k miles of supercharged fun before you got it, were the bearings done when the S/C was installed, had something already caused the marks on the piston and damaged plug that led to your almost immediate issues, so on and so on. May never know.

As to what now, are you willing to drop another 10k+ in it? Used motor, 6 to 9k depending on mileage and condition, installation of new R/B's on used motor for peace of mind and the "friendship" labor rate. And if you are reinstalling the S/C you will want to make sure everything is tip top including the tune.