Might buy a 340 block...

This poor guy wants to know approx. what a 340 block is worth and everyone goes on a tangent on him???
It depends on the year. 68-70 seized complete long blocks I have gotten $700 for. I just recently picked up a rebuilt 68 340 complete engine that was in a FORD for $500. Its going it my GTS as its period correct. I also just bought a nice running 71 340 engine for $1600. They are worth what someone will pay if they need it. You haven't given enough info.