All chevy Dana 60's will have king pins at the knuckles. If it is Chevy and it has ball joints, it is not a Dana 60. As someone already said, 8 lug does not guarantee a 60. Also there should be "60" cast in the lower front webbing of the housing.
I suggest checking out this link for more Dana 60 info:
http://www.pirate4x4.com/tech/billav...ont/index.html
-Mike