Back to the OP, I'd also recommend changing to a different oil to begin with, even if it's just to get some more time before an overhaul.
I've recently switched to Penrite HPR5 5w40 (with the advertised "extra 10 zinc"). I was dubious at first going from a 10w40 to the 5w40, but I've really noticed it has made the engine smoother, quieter and improved fuel efficiency. Yeah, interesting right. It's also usually a bit cheaper than Castrol Edge, the widely accepted best oil for LS1.