There is one vac line that runs to the tranny, and another , smaller one, that runs to the air cleaner. There are no other ports on the front of the carb.

I do not think the car has the stock Rochester 4bbl on it.

When I ordered a carb rebuild kit, the number I had did not match what came on the engine in 69.

Should I "T" off of one of the lines? If so, which one?

My guess would be the tranny vac is the ported, and the air cleaner line is the constant.