Ryan, what you can get away with depends on what you've got, and the only real way to evaluate that is to look/test inside. You can pull the head
to examine the cylinders and do a leak-down test, or buy (rent? borrow?) a borescope to look inside them after you pull the injectors, and so on.
Or, ask around and try to find a respected local diesel
machanic and pay him to come out and look at it. If he says "first, I'll have to take off the head" you might be able to do some of the prep for him, to save some of the price
. Depends on who you get and what they're willing to do with you.
Diesels can almost always be rebuilt--if there's just routine wear, if there are parts
available, and IF the local labor rates are right. Last summer my friend needed to rebuild
and have injectors serviced, and the local quotes were all sky high. It was half the cost to ship it out UPS (to an authorized shop in a lower-rent state) including the UPS charges, and he got lucky because UPS "ground" also promised next day delivery
, more than 200 miles away. The same shipping
charge/time that it would have taken to send it out locally! (But at twice the price--that wasn't going to happen. 10%, 20%, maybe, but not twice the price