Are all 340 blocks the same?

I don't know the answer to your question, but don't listen to the 340 haters man, if you got the money to burn, let it burn! More cubes is more cubes, assuming you put a stroker crank in.
You are just north of Mooresville correct? Did you go down to the Hotchkiss shop and get a chance to see Consulier's Dart Sport project when it was under construction?
http://www.forabodiesonly.com/mopar/showthread.php?t=270106&highlight=Hotchkis+dart+build