Value of a 340
IMO, right about now....(unless you can score a decently priced 340) they are only worth their prices if you need your factory 340 car to have a real 340 block.....otherwise, why NOT go 360 or stroker/360 block. 340's are cool, and I've got one in my 'vert, but....nowadays there are soooo many other great choices in heads, stroker cranks etc...
Come on...even a hopped up 318 with 302 casting heads and the right cam/headers and a little port work should be relatively cheap and VERY impressive alternative to a 340. I wouldn't mind having an extra 340 block laying in my garage though....if the price were right, and it wasn't .080 over or "repaired"....lol..