how do you get off the vacum advance?

[rusty ol' 69']

My truck likes to gulp the gas (or bog) when I blip the throttle. I just rebuilt the carb and it did this before I rebuilt it. The carb seems to work fine, but the bogging is still there. So I checked around this site a little and found out that my vacum advance could be the problem. So I took the line off my carb and blew into it and I did not see the advance move at all. Do I need to blow really hard to do this? Anyways, I figured I would try and take it off and mess with it. Well I got the cap and rotor off ( my truck has a points type distributor just to clarify things) and I can't seem to get to the screws. My question is: Do I have to take the points and everything else off to get to the vacum advance unit or can I do it without having to take everything apart? I don't want to have to adjust the points 'cause I don't have any feeler gauges just a crapy step spark plug gauge I got from kragen and that's why I'm asking.

Thanks,

Rusty