In your picture showing the engine bay I can see the master cylinder. It doesn't have a hydraulic clutch. If you want a vacuum booster, I would try a CarQuest or a NAPA auto parts first. See if the have one that will fit a 60 through 66 on their list. Some minor mods may be needed if you get one not made specifically for your year,
Scott

Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!