Next stage for my 360 build?

Theres oiling mods that need to be done for 7,000 rpm.
That purple 292/.509 makes peak power at 6500 or less.
You'll be hard pressed to run 7000 grand and actually make power that is useable.

The best way to go about building a great lower end is to have an expert machinest work on it and use quality parts. While stock parts can do it, it takes extra effort in mahining them.

If I was building a 7000 rpm scream machine, it would be with a forged crank, serious con rods and have the machinest know i'm looking to build a high reving 550+ hp machine.