Injectors are expensive... get them tested first ("buzz test", cylinder contribution test). I'd let that be the deciding factor. If they pass and you see no leaks I'd go for it (be sure to check eng. valley). Oil and filter every 5-6000 miles (15 qts!), fuel filter every 15,000 miles (Ford spec). A few little oddball quirks may come up since the truck has been used heavily (but they're built for that), but for most, someone here should be able to give answers.
Welcome to the world of Ford diesels (if you go thru with this)!!