I'll let you know. I tried a 2V set up right before I yanked my engine.
If you think about it, if you jus do the 2V adaptor the Offy should have an advantage. The offy negates the restrictive log intake by placed a 1v carb between every 2 cylinders. With the 2V adaptor, you're still trying to force fuel/air down the log to the outer cylinders. If you do the 2V like some of the guys here and modify the log, that would be a little better.
Slade