This could be a great buy if you plan to operate under part 91. No requirement to do engines at TBO under 91. I've seen these engines go over 2000 hrs, but I wouldn't count on it. Send some oil off for analysis, remove the oil filters and cut them open to check for metal. Both of these things will cost you under $100, and that includes buying new filters. Have a compression test done on warm engines, preferably with you present.
Note the trends in logbooks over the last few annuals. Have cylinders been replaced, or are these the originals? What major repairs have been done in the last 10 years? How many hours per year has the plane flown over the past few years?