One sneaky trick I've been known to use on round track race car carbs is to re-thread the main jet holes on different carbs to accept Holley jets. (the same ones fit 2-bbl and 4-bbl Holleys) Those jets are available in just about every diameter known to mankind, and once the carb body has that thread, you've got a wide variety of mixture options available. They're CHEAP, too!
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!