Average price on 340 block

Hey guys ive been looking around for a 340 block and i have found a couple but im not really sure if its a good price or not. One is bored over 60 so i dont want that one but i have found another that has a fresh .020 over bore (4.060 bore) that was done ten years ago and the block just sat with wheel bearing grease in the cylinder walls. He said its painted black (also done ten years ago) said there was no rust on the block. Hes asking 550 for it which i thought was a little high but not really sure what the going rate for them is. Also has new cam bearings and freeze plugs installed (also ten years ago).