Dumb tranny Question (TH350)

Does the vacuum modulator need to be hooked up to get the ****** to shift? I drove my car around the block for the first time and it goes into gear well it just seemed like it stayed in first the whole time. I didnt really bring the revs up at all and stayed under 25 but was curious anyway. Can you hook it up to just one carb? (I have 4)

 

hey there
yes the modulator does need to be hooked up fot the th350 to shift properly
usually the vacuum source is right at the manifold
but any constant vacuum would be fine (manifold not ported)
been followin the build love the car my hats off to ya
say hi to mitch

 

oh by the way not a dumb questionat all