yup I'd do it. IF that has been run on propane, it is difficult to ever get it running rich... means engines last longer than on gasoline. So, yea, possible never rebuilt. Has never needed it.... I would be curious to see what hot idle oil pressure is.... 10-12 lbs at 750 rpm or so and 35-40 ish at around 3,000 rpm. timing chain might be a bit floppy....
nice find for $1000