360 with 350-400hp, 6,000 RPM- what does it take?

Based on previous advice, I'm having my 904 built and I have a prospect for a 8.25" axle...my goal is a reliable 12.9 car...

This forum has been a great help so far...but since I'm getting a bit more specific/realistic with my goals so opinions would be very welcome.

So how would you pick a motor and what would it take to hit these numbers (350-400hp, ~6,000 RPM)?

Is there a best year/version of the 360 to start with? Any years/versions of the 360 to avoid as a starting point?

Thanks a million for your opinion/insight.
-Mike