How much woulod you sell this for?

[sam's 72]

350 4 bolt main, 40 over. This is a friend of mine selling this and this is what happened. He built the engine, all new bearings, ( Rods, main and cam bearings ) New rings, new oil pump, had the heads completly redone, new valves, news seats, springs retainers, new performer intake, new oil pan. he got the engine all together, put it in his sons truck, fired it up, oil pressure came up to 80 psi, every thing was going good, while breaking in the cam, the oil presure started dropping off slowly, once it got down to 30 psi, ( 15 min run time max he said ) and still falling, he shut it down. long story short, he thinks that one of the cam bearing spun on him. now he wants to sell the engine, just like it is, it has a new starter that goes with it, and another set of heads that are bare, they are 2.02 and 1.60, he wants to know how much he should sell this for? All he has done was pulled it back out, bought a crate engine and put it in, and this engine has been sitting now for about 5 months, so how much do you guys think it would be worth. I looked at it and pulled one of the valve covers off of it, and there is metal shavings in the oil and laying in top of the head. I am thinking that it might not be hurt that much. What do you guys think?
Sam