How much would you pay for this 340?

why is a .60 over 340 scrap?
it's not necessarily scrap, but economy starts to become a factor as well as limits of the block-- taper, strength, heat control, etx.

sure you could sleeve it off, but that's another 1K on top of whatever else you need.

i'd consider going to 60 on a stock or very close to stock rebuild, but it would be a non starter for me on a performance build.