I assume this means that the seals are on their last legs. I hope to make one more event at Pocono. When it's/I'm done, what do I do next? Can I pull out the engine and have it rebuilt? If so, what am I looking at in cost and who should do it? Or, should I get a new one. If so, where?

 

well, typically when water is coming from the engine then it would come from both pipes so you could have just gotten water in the muffler from the last time you washed the car, that or you have a huge exhaust leak to the left muffler.