If the unit starts I would be snapping that one up if it was priced less than $75 and the drive works.  Might even consider $100 depending on overall condition.  That engine/deck setup was one of the best units Toro ever produced.  I had mine for 25+ years and then the drive went out six years ago.  This was the only weak part of the unit.  I only replaced it due to the fact that my wife had to take over the trimming jobs, while I recovered from cancer, so I got her a Personal Pace mower.  My neighbor wanted a push mower for trimming, so I removed the drive gears and he still has me service it each spring.