I'm not sure this is a good idea. One of the few things I don't like about my truck is the lack of aftermarket support for the 6.2. It currently costs ~$20k to build a 6.6 liter (that's only 21 more cubic inches, a measly 5.5% increase). And on the forced induction side, we have both the roush and the whipple guys making great power, but they are all clamoring for an 8 rib drive system and nobody seems to be listening.
When you have all the options in the world, why pick the one that is the most complicated? I'd pick a Ford or Roush crate big block. Or a Mustang engine with a more robust aftermarket. Better yet, swap in an LSx.
I'd stay away from the 6.2 until a larger or more reasonably priced stroker option comes along. Or until whipple gives us a kit based on their 4.5 liter blower with an 8 rib drive system.
Just my opinion.