Hi everyone. I need some advice on choosing a pipe and header for an older engine.

I have a brand new RB WS73 that has been in a box for 12 years. I run at large tracks here in So Cal - Thunder Alley, Revelation, Wild West, etc. This motor has a ton of top end, so I want a combo that will give me more bottom end power
I have a couple old 9886 pipes for it, but I don't want to run those, as I'll get horrible mileage.

Was thinking the 9901 pipe and the 41001 manifold. Any thoughts? Go with a longer header perhaps?

For reference, I currently have a Protek Samurai in the car with the OS 2090 pipe, and 75mm or 85mm header and am very happy with the powerband of that combo.