340 crank..junk or saveable?

cosgig, re-measure your throws, from where I'm sitting I don't see any abnormal wear that would indicate a .015 under as opposed to a possible .010 under grind that was done on that crank!
Now if it is a 318 crank like Mr. Sinister has illustrated between the two variations , the 318 choice is a much more desirable selection when building a 340 WITH modern day light weight pistons and rods.