I've got a 196 cubic inch OHV Rambler engine with one of those carbs on it stashed away in the barn. I wish I'd scavenged up a few more of them when they were plentiful and cheap.

The Keihin carb for the 74 and 80 cubic inch Harley engines looks pretty promising- - - -diaphragm-operated slide pistons, and just about the right CFM to supply mixture to one stovebolt cylinder at a time at moderate RPM's. They're also a lot newer and a lot less expensive than the Carter side drafts, and less than half as long- - - -better clearance for shift linkage and steering. If I can scavenge up a few of them in rebuildable condition it might be worthwhile to do some dyno testing.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!