BIG GIANT HUGE THANKS to alohagreen for making this all happen: I was searching for a mate to the Carter YF 820 carb that I already had, so that I could put the Darland 2-port intake I got. Rick had one and I had an 833 that he was looking for--the swap was on and this is the fruit of all that labor. So pleased with the mock-up and, short of the Willy-Willy or Chuchua or Hickey aluminum head that I've never been able to find, this thing is turning out SO. COOL.
Now, to figure out carb linkage and the search is on for a pair of Stelling & Hellings "helmet" air cleaners, too!