Those are great little units. One issue I'd worry about is lack of parts. Anything that old is REALLY scarce in junkyards as very few keep older stuff around long anymore. Even simple parts, while still available are no longer kept on the shelf in many parts houses. We had an Dodge van with a slant six and lost a timing chain on a trip about 15 years ago. I was surprised when the auto parts store had to special order it. Decided to update the truck because of that.