Looked at Some Motors Today

I had a look at some small block mopars today and I have a few questions,
1) 1973 340 long block, stock rebuild, .060 over on the cylinders, X heads. Is this a usable block at .060?
2) 1969 340 short block, standard bore, forged crank, stock pistons. What's this worth?
3) 318 truck block (block only) bored 4.070, four bolt motor mounts. I've never seen a block like this. He say it's stronger than a 340 block? Is this true?
:burnout: