I are a mo-chinist 2.
You done good. But I gotta ask...WHY? You can buy a new K&B NV assembly from "The New K&B" aka MECOA/RJL, PN #2918. I took a picture of it, but can't get it out of the camera right now, for some reason.
Hmmmmm.
I'll try to edit it in, later. Steve
Edit: I just got the pic out of the camera, resized, compressed, etc. The current NV Assembly is pretty close to the old GH assemblies, except the step isn't in the spraybar, and the knob on the NV is aluminum. I like 'em for profiles, but prefer Randy Aero NV assemblies for cowled engines.