As we continue this conversation from three years ago, I would like to add if you still have the factory turbocharger you are well past it's efficiency range at 7000rpm. While extra headroom is never a bad thing, you'll need a pretty serious turbo to justify taking this engine up to 8000rpm.
For what it's worth the 360c seems to be pretty readily available online at various retailers and also in stock at a wholesaler I checked with. Perhaps they have restocked since you last checked? It does have a heck of a price tag though.