Best 340 stroker kit?

Thanks for the contact info for Bloomers, I'll be giving him a call.
From what I've seen posted around here, it seems to be agreed that the cast cranks are only good for about 500hp. I would like to make between 500-550hp and I've heard that the Scat cast cranks are good for 600hp. Anyone know if this is true? I'd love to stick with the cast piece to save a little money and rev a little quicker.