My 1996 3126 has 139,000 and didn't miss a beat in the six month 6,000 mile trip last winter. I even ran out of fuel and it started right back up after pumping up the filter. (not recommended)
If you can get the maintenance records and verify that the normal PM has been done, it should be fine. In particular, there's a valve lash adjustment that needs to be done at 30,000 miles, and every 100,000 thereafter. Also,
verify that the fan hub bearing has had regular greasing. I throw a bottle of fuel injector cleaner (Power Service - get it at Walmart) every fifth tank or so.
This engine is normally 250 HP but can be chipped up to 300 and up to 350 with a turbo-charger change.