340 r.i.p.

If that crack extends down to the main webbing the block is toast. IMO just move on. It's not number matching and already whipped. I'd build a 360 before a 318. The prices are similar unless you get a 318 for free. Ppower wise the 360 is more fun on the street. There's also the option of buying another 340 and building that into what you want. They are the best sounding at 6K and higher...lol.