OK, just talked to the guy that I got the extra 3L block from. All the bearings except the one spun rod bearing is fine, so I guess I'm just going to switch the cranks instead of fixing the block that exploded. I also pulled the engine out today, the front bank is definitely shot! I can see oil coming out of the front exhaust manifold, and I looked into the front manifold I saw some metal shaving. I don't know what to think. Hopefully the rear bank is fine and I only need to have head work done on the front.