'79 was HD's very worst year of all time, and the end of the AMF era. '82 was better than '79, but still quite problematic.
Iron head Sportsters are the worst of all things HD. They shake themselves apart, everything breaks or falls off, weak transmissions, clutches, top ends, generator electrical systems, I could go on. They were fast, though, for the times. A friend of mine built a small aftermarket shop into a HD dealership on iron head Sportsters. He raced an iron head Sportster in top fuel, so he knew how to work on them. No one else would touch them. He always said you need 4 cams if you want to go fast. We counted over 20 of them in his shop one day, in a shop of about 1500 sq ft or less. They were lined up around the walls, parked in front, everywhere.
Compounding all the design, material and build quality problems is the fact that they were mostly owned by people who couldn't afford to keep them running. So, complete shade tree DPO issues are on any that you will find.
Anyway, as I said, you can get a decent Evo Sportster for maybe $500 more than an iron head, and that five bills will go into the iron head to try to get it running if it isn't when you get it, or it will go into the iron head in your first week of ownership when it breaks. The Evo Sportster is bulletproof.