Well, as far as the radiator goes, as long as the tanks aren't damaged or corroded; you can have the radiator re-cored at any reputable radiator shop.
Since clearances are tight, you must be careful if you select a universal type fan; as fan to radiator core clearance is minimal on these trucks.
Harmonic balancer? Hmmmm, I'll have to let someone else step in on that question. Check the links page on the home page of this site. There are many vendors there who may be able to help you (some of them even support this site!) or guide you in the right direction..........
