EJL,
It's my understanding that Mopar went lock stock and barrel in a wide bore short stroke direction. Now they need to run a smaller bore and longer stroke. Which they can do with the current configuration, but with more of a weight penality than anticipated. With the new limits, they probably need to squeeze the bore spacing a bit closer together. This would make it a new configuration. Impacts crank and cam length, not to mention intake, pan etc. Throw away all your old stuf..I'd get rid of those skirts as well for the Cup environment. Just my opinion.
Again, this is my understanding of where they want to go. I don't spend a lot of time on Mopar engines
Windsor