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.