My favorite place to look is '70s F250s. They are everywhere, and they all had a Dana 60.

Be careful when you buy because the Dana 61 is out there in quantity and some of them look pretty good with semi floating hubs (car style). Mostly they come under vans, but they are built for low numerical gears and more of a hassle to regear. The Dana 60 HD has extra beef in the case and is too heavy for a street car, IMHO.

R.