Just like the title says, I'd like to make sure I cover all my bases when I talk to a salvage yard about a 6.0 they may have in the boneyard

What vehicle was it pulled out of?
What happened to the donor vehicle (damage wise)?

What else, seems like I'm at the mercy of the person I'm talking to.

 

mileage would be nice to know.

also find out what all they are including, although you won't need accessories, intake manifold, etc. those are all items that you can sell on ebay to help defray the cost of the motor if you can convince them to throw any "other" parts like that in on the motor's purchase price then take it. Remember, they are like used car salesmen, you can negotiate, but if you tick him off he won't sell it to you at all... so tread lightly

 

if your wanting it to bolt to a 4l60e make sure its 02 or newer.

You want alum heads