There are some adapters available, but it's fairly simple to make one with a block of aluminum and a little machine work. We build custom adapters for that carb all the time for the roundtrack cars, since it's the only one the Nashville Fairgrounds track allows. Those are going on smallblock V-8 manifolds, however. It wouldn't be too difficult to make one for a 6-cylinder.
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!