Keihin CV for Harley-Davidson adapted to a STovebolt.
Thats an intriguing setup.
I ran one on my 77 HD Super Glide and other than one problem I encountered with it at the beginning, it proved to be a dependable carb for the 18 yrs I ran it.
The problem was that the accelerator actuator rod was a hair too long which would make it spit a batch of fuel at idle causing the engine to burp and sometimes stall from being flooded. After I filed a couple 0.001 off the rod it never did it again.
The engine was a 72 CU V Twin, guess what 3x72 CU = 216 CU

Dave