sounds like you have a good one. congrats. sometimes the speedo's aren't accurate, say if they got changed, which was not that uncommon. recoring a radiator can get expensive, especially on such a large radiator. a good boil at a rad shop can tell a lot about its condition and what should be done. however you will will want to do what you think is best. cudo's to you for keeping her tip top. if memory serves, and it does not always, there are one or two freeze plugs(expansion plugs) on the top of the water head er. it has a tendency to collect exterior water and get pinholes. also is one at the rear of the block up against the firewall. only easy way to get at it is to remove the upper floor board above the tranny. with such low mileage means it has sat somewhere for very extended periods. deuces love to be used and perform much better and less maint the more you run them. some of the copper gaskets can be reused if re-annealed and aren't too deformed. torqueing the head nuts may require a special tool as you have very limited space to work with. a short offset(90 degree) for your wrench can solve that. and it does not change your torque specs. go in stages till you get to final. then recheck after a short run in period. the manuals have pretty good details and are available on this site. while I am thinking about it, a good two or three coats of copper gasket on the head gasket is a good thing. not that Martha knows anything about diesels. I have heard about shellacking the block side of the gasket. not a fan but some people like to glue it to the block. some of the head studs penetrate to water jacket cavity. while i don't thinking gluing the head studs is good a little never seize on some of them may help with water blow by. sorry for babbling on about this stuff. enjoy your wrench time, I do. I love these when they run right. barely have to tickle the starter and she comes to life.
