Need Help with Powerglide vacuum line

[Metalaroundstone]

Hi guys,
I could use a little help figuring out how the vacuum line from my Powerglide transmission in my 66 with a 327 should hook up to my engine vacuum. What is currently there seems very strange to me. The tubing from the trans seems to require 5/32 vacuum line, but it hooks up to a section of metal tubing that is sized for 9/32 tubing, which then connects to a 5/16 vacuum tee on the intake manifold. It is clear that all this is to up-size the vacuum hose from 5/32 from the transmission line to 5/16 port on the vacuum tee on the manifold.

My question is this: How should this vacuum line be handled to match how it was done at the factory? Is what I have makeshift or does this somehow match how it was done originally?

I can't seem to find any illustrations about this. Any help will be greatly appreciated. Thanks