Carb Question (Edelbrock)

I've got a carbed 302. On the front of the carb, (edelbrock 1405) I've got three vac ports. The middle is PCV Vac (It's hooked up) to the right is a smaller port that I've been able to determine is "full time vac" (plugged up, what's this one) and one to the left of the PCV vac that I cannot figure out what it is but it is plugged also. The carb is mounted on a spacer that has vac ports that are plugged. I've had the car about 6 mos and I bought it more on word instead of a really inspecting it. Just wanting to get a few bugs worked out till I can get it parked and have the engine redone. It's an 86 4cyl with a 302 transplant. I believe that the prob I'm having is in the carb

Thanks

My prob is that at about 3000 RPM I lose power. The car starts sputtering. Sounds like it's flooded or starving for gas. When I shift gears or slow down, everything's fine until I get back up to the 3000 RPM range. I've read that the secondaries on the carb open when the primaries are about 65% open. I would guess that this is about the time my prob starts. I've read that a lot is dependant on air flow through the manifold, but I have no line hooked to the manifold just to the PCV.

Thanks