Getting under the car with a flashlight and a rag, you should be able to trace the coolant leak back to its source. With the coolant on the K-member, my guess would be the water pump weep hole. With the car being driven infrequently, and the gunk in the coolant, it's very possible that the pump shaft seal is the culprit.
As for the oil, that's an interesting one. Losing three quarts in 200 miles is excessive to say the least. Losing that much oil should leave some kind of evidence as to where it went. If it is going out the exhaust, I would think you would be able to see the "blue haze", smell it the oil burning, and detect an oily residue inside of the exhaust tips. Take a good look inside your exhaust tips, all the way in where the round pipe joins the rectangular tip, swipe them with a clean cloth, and see what you find. Your spark plugs should also give you some indication if you are burning oil. Check your plugs to see if they show signs of oil burning by being "wet" and oil fouled.