I'd take the BK's out, unless you find a buyer who knows the product they won't be willing to spend extra to cover the upgrade.
A practicle examle of this (I think), I recently bought a Fender Custom Shop strat from sounds great (used), it had Irish Tours fitted, but the description didn't mention that it also came with the original pups. When I talked to the guy at Sounds Great he said that they'd recently dropped the price by £300 because it hadn't sold, and I'll bet if it had original pups in it it would have. Personally I nearly blew a gasket when I saw it had IT's fitted because I knew what that meant, and I'd have paid the original price for it. :)