I've had the Offy with small Holley on for about 2 years with no problems. I fabricated some elementary brackets to make the 1 bbl linkage work. I made it function the exact same, just that now, it's horizontal instead of vertical. I'd be more than happy to show you my setup if you'd like to check it out.
I just looked at your profile and see that you're a painter. I need my house painted, wink, wink, nudge, nudge.
-David