Is there an update #3? Was reading about the Amals over on the Delphi Bonnie forum, and thought maybe you could post something in here.
Also from Delphi that you posted; "A friend of mine just installed a set of 36mm Mikuni flatsides, not the HSRs with acc pumps. He got them from ProFlow and only paid $140 each. he just needed to buy the special 2 into 1 throttle adaptor and make a simple angle iron brace to hold them both steady. I heard them run for the first time today and was very impressed. A very viable alternative if you can do the small work involved in setting them up."
New thread for this one?