1989 Toyota corrolla, le carbureted

Hello, Bob and Ken. I was wondering if you would be kind enough to help me with this problem I'm having with my car. I have 189,000 miles on it and I bought it about a year ago. After about 1 month of driving I noticed that the temp. Gauge would rise to the very hot, and I would have to add coolant and water. After about another few days of driving, I noticed the car was surging at highway speeds. I let it sit after that for about a few months, and when I went to start it agiain to move it to the car port, it was leaking water and oil mix, coming from where the engine and transaxle join. Any help on this matter would be Greatly Appreiated. Thanks. Al. :D