Here's one on converting an E85 back to pump gas.
Alcohol carburetor/blocks return to gasoline use?...
Might be more. Seem like the concern was in the booster's passage, not the angle.
See if this application being discussed below looks similar to yours.
If so, then I'm with Mike - I'd start where Mark recommends, which is IFRs oround .035 - .036. (post 13.)
Annular HP1000 Emulsion Setup
Some discussion on QF 850s
Quick Fuel SS850 accel pump cams