value of 70 LS6 blocks

[black69]

a guy I know has 2 of these blocks sitting under his work bench (he said both of them are out of LS6 chevelles). they are both good with complete rotating assemblies still in them, nicely put away (oiled). I am clueless on what these are worth (no heads). he could careless about these old blocks actually (I was there to look at some old wheels, and I am going back to get them), I spotted the blocks and asked.

$500 a safe purchase each if they had a VIN to prove its a LS6? $1000 each? if decked, dont buy?