340 crank questions

So, I have a cast crank 340 that needs a re-build. I was wondering if I could use an internal balanced 318 crank in the 340 instead? I was also contemplating on using a 360 crank, grind the mains down to the 340 journals and hanging .060 360 pistons on the rods, bore the block .020, and go that route as well. Will any of my ideas work?