Steve, I got my hands on a very tiny Walbro for my 302 engine. I contacted a couple of the members of the BAEM club and asked them how they used the Walbro carb and what if any modifications needed to be made to it. I was told to buy the lowest pressure electric fuel pump (2-4 lbs) to start with. The only modification needed for the carb was to make an adapter plate and reduce the size of the venturi.
In all my searching I found some very good information on the functioning of these little carbs. The PDF files are too big to post so drop me a note at my email address and I'll send them to you.
I'll let you know how I make out with mine. I'm just finishing up the fuel tank, it's an aluminum 'Moon' type tank.
George