I had a Pro charger seize on me once, I thought the engine was toast, but it was the blower that was seized, shortly before it went it had a strange wine to it. I took the belt off and the engine fired right up and was fine. Let's hope its the blower in your case but if you have a stock engine I'm willing to bet something in the engine got damaged. The stock 392 does not do well on boost, either the lifters or the pistons will go eventually.
I have no clue what that spring is from!
I have no clue what that spring is from!