First welcome to the site - hope you find the information here helpful in your endeavors
Thanks for including when and where the car was built - helps with getting to an answer
I'm guessing when you mention "valve" your referring to the backfire valve in the system.
Not sure what the Assembly manual shows (there are mistakes in the drawings and info contained on some pages) but here is what and how they were built. Basically if the drawing shows it on the passenger side its mistaken and that page was likely redrawn and replaced after the one we have was published
Here are a shots of few San Jose T codes from 66 (have plenty more but this should do it
First two pictures are from a car where the distribution plumbing has been removed
Hope this helps