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Re: vacuum lines
The line from your distrubutor will go to either a ported or manifold source on your carb depending on what you want. Ported means that at idle, the port does not draw a vacuum, but just off idle it will. Manifold means it pulls vacuum all of the time except for wide open throttle, at which point the entire engine pulls no vacuum.
I personally prefer manifold vacuum source to my distributer because it advances the timing just a bit that makes for good idling and fast responses.
As for the line from the valve cover, that is your pcv and needs to go to the big bottom port on the front of the carb. That is how the engine draws out fumes from the crankcase.
And the third one? I'm not sure which one you mean, but if it is the brake booster line, it goes to a large port on the bottom back side of the carb.
Hope this makes sense to ya.
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