OP the stock crank will be fine for under 1000hp and daily driving. Since many here are already doing that. The link I posted earlier can make you a billet crank which is what I am running but specs for the stock 3.7L. That's the route I would go.
As for your question on the fast intentions stage 3 kit. You should expect about 1100whp out of it. There is only one person with the kit "carbon Z" and his car won't be running until after zdayz. I have talked with fast intentions at length on their turbo choice for the stage 3 and the stage 4 in my case and I am fairly confident that carbon Z will make 1100whp. Whether that's with over 30psi or mid 20's is yet to be seen. And because there are no public turbo maps for these turbos I couldn't tell you where the efficiency ranges are and where you theoretically be able to make that power.
A closed deck 3.7 with a FI stage 2 will make 1000bhp no problem!!!! A stage 3 will make it in whp and a stage 4 will make it on pump gas with ease.
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