I would buy it for $100 at the most and if the engine is shot find a lawnboy that is running and transfer the plastic top over to the new engine. I like the odd ball IH equipment like the front tine tillers, push mowers,string trimmers, window AC units, fridges/freezers and etc. Just shows they had what you were looking for all from one place. Try finding a farm equipment dealer that can match IH today.
Hope you get it as it will be a reliable and working conversation piece that you dont see too many of anymore!