Small dia pipe sticking out of the big triangular boss, its a pipe without a ridge on it. This is rigged up to the AEI unit. Im not sure about this.
If this is the outlet i'm thinking off then it's wrong. I'm sure you mean the one that is on the right of the carb when looking from the front and it points almost at the rocker cover.
If it is then this needs to be left open. You need an open pipe running from it to somewhere out the way of the exhaust, it's some sort of failsafe should something go wrong internally with the carb then the excess petrol is sent down there.
The pipe for the AEI unit should plug into the small dia outlet on the rear of the inlet manifold, it's in between the larger take offs for the oil breather and master cylinder.