78Buford has sold many '78-'79 Ford HP60's including 3 just a year or so ago. They were used, but complete and in good shape, and one even had a Detroit locker in it. I don't remember exactly but he got less than $1k even for the one with the Detroit and that was putting them on eBay, Craigs list, and several off-road bulletin boards.
Are you sure they where HP King Ping D60's? Maybe his are newer ball joint ones or HP 8 lug 44's. Was he willing to ship them or just local pick up? Because all of this makes a big difference. I'm as thrifty as they come when looking for parts and when I was looking for mine 4-5 years ago I couldn't find one in Montana or Wyoming for under $1500, and that was only two of them. Most of the ones out here are still under trucks. Mine came from Missouri, my parents found it for me. I did buy a ball joint one for $1200 out here, sold it for $1300 shipped to Louisiana, cost me around $150 to ship it. Figured out I wanted the closer spring pads for my sas. I hate to say it but if he isn't getting $1k something is up. Here is the newest one for sale on pirate,
79 ford F350 Front stock HP dana 60 never cut or touched complete, but is missing a few bolts. I was told it was from a running truck. 69.25" WMS to WMS
$1,500 firm CASH ONLY No I will NOT take less I will keep it, if I don't get what I want.
approx spring pad span = 31.5"
Here is the search link so you can check out what people are getting for these.
http://www.pirate4x4.com/forum/search.php?searchid=8690955
All I'm trying to say is price wise building a 78-79 HP
king pin 60, and building one of these is pretty comparable.
edit: Now that companies are coming out with fabricated housings, like ruff stuff, it is bringing the price down a little. Since I could almost do a ruff stuff housing for what I paid for mine.