I like to drill the stud holes out and tap them to accept a 5/8" Heli-Coil, then install a threaded plug with LocTite to fill the enlarged hole. Then I drill and tap the plugs to accept the carburetor mounting studs on a closer center-to-center spacing. If I want to go back to the wider spacing, it's a simple matter to break the LocTite loose with heat, pull the offset-hole bushing out, and replace it with one that's threaded on center. Best of both worlds!
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!