Roger,
I had the same issue with the weber manifolds wouldn't fit over Bell manifold, I changed over to a Moss/TriumphTune one that has 2&3 coming over 1&4. The Moss one is no where near as well made as the Bell one, Moss one is a three piece and the first one I received wouldn't mate up to the head at all, the second one mated (just) but I had to cut one of the pipes to length going into the Y piece. But it works, and got a boss welded into it for lambda sensor.
If you see the pic of my install earlier in this thread I have used a piece of 15mm copper pipe to make a vacuum manifold to connect the 4 inlets up to as well as the map sensor, fuel pressure reg, servo, IAC and the PCV valve.
Moe.