Staffo, you don't NEED N3RF needles; with the stock cams you can use stock NBZY needles, shimmed as needed, just fine. You may be able to use the NBZT needles also, with no shims.
Shim width can vary, so I suggest having the shop measure them prior to installation.
You can also do the 45 pilots, although the pilot screws will need less out/more in than with the 42's. I also ran 45 pilots with the stock cams.
The above said, I would test the mains first, get them sized right for WOT high RPM, & then focus on dialing in the needles. My gut says 148 - 150 range mains for max power for your application.
The mid range A/F will then point to which needle/shim combo you need.
