E31, if its a solid base and has not been messed with and is uncracked, no broken studs etc, should go for $150 easy, and that is a low price. I know a store that is holding onto about 3 of them, and asking $300 a head. They know the price will just go up on them.
As for upping the CR did you even open the link? You can get away with a certain amount before you need to use shims, but you would need to know the total head height to make sure you don't take too much off.