HD version of volume encoder did not fit.

I think the plastic of the faceplate could be drilled to allow it to fit ,but the clear plastic behind it might be hard to drill without fracturing.
Do you happen to know the pn for the encoders used for bass/treble/fader, etc.? My volume has always had ...

Okay, but I don't see the elbow that I need in the diagram.

The tubing that goes from the top of the valve cover, down between the intake runners, over to the passenger side of the intake manifold, and elbows into the intake next to the power steering pump.
The elbow, that everyone has problems with, I have finally found out what you're talking about. Now I ...