2.5 psi sounds about right to me for a weber side draft. Going off of my knowledge from my 77 midget, it's weber side drafts specify between 2 and 3 psi (which is all the funky diaphragm style fuel pump can do anyway). But I will say, getting them synced up is a bitch and a half. the easiest way to do it is with a special spark plug with a glass center, so you can see the color of the combustion within the chamber.
But once again, Arro. You had better enjoy that car. I was literally, patiently waiting, not saying a word on that topic, so I could pick it up in in the first week of january, get it running, and park it next to the omni, for the exact same custodianship reason.