I do not see a totally complete answer above so...
Yes, your tranny will not shift out of 1st gear without that vacuum line to the module on the side of the tranny connected and providing "full" engine vacuum. Full vacuum which can either be from an intake manifold port of a full vacuum port on the carb.
I suggest a vacuum gauge so you can test the various ports. I also recommend a brand new section of vacuum hose because if there are any leaks in it...
I made the mistake of connecting to a carb port that did not have full vacuum (incorrect base plate gasket) and my tranny did not shift until I tested for full vacuum and switched port connections.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
