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zuburg, just FYI: (and why it matters) the '55 & '56 carburetors and distributors aren't interchangeable.
'55 uses a single vacuum line between the the carb & dist and '56 uses a double line. IIRC the dist vacuum port pressures are not the same between '55 & '56 carbs.
The round vacuum advance unit on the '55 dists is a single can and the '56 uses a double can. The internal springs are also different.
Since it seems like you have a '56 carb & a '56 dist you may have dodged a big problem there, even tho it may not be a 'T-Bird correct' carb.
Are there any part numbers or a # tag on your distributor?
When you look at the lower portion of your dist. housing does it have the part circled in yellow?