Depends how much power you want to make, but the 6.1L crank is a good choice. I've talked to a few high HP engine builders that are using them (HHP,BES,etc...). I told them that I wanted to make 1000hp and they told me no problem on a boosted 6.1L stock crank.

I'm just starting going down this road. 6.1L crank, 03~08 block/heads, stock rockers, stock non-MDS lifters, and there are some new non-mopar drag pack intakes being cast.

80mm turbo should be able to make 1000hp pretty easy/reliably.