Value of a 340

I just saw where someone had a rebuilt late 67/early 68 340 for sale with some pretty decent parts in it for $4000. I understand 340s are not on every street corner and might be worth that and maybe more to the numbers matching crowd. To the guy looking to upgrade from a slant/273/318, are rebuilt 340s worth that much ? How about complete but not rebuilt or checked and ready to rebuild with commonly available parts? Inquiring minds want to know.

EDIT: I see as of 11:15AM EST on 1/18/10 47 members say they gotta have a 340 compared to a combined total of 43 members for a 360/big block/273/318/slant. If you gotta have a 340, what would you pay to get one, either already rebuilt similar to superdart340's motor he's selling or for a core ready to rebuild?