750 CFM Speed Demon on a FE390. That's after trying an Edelbrock and a Holley. Mine has mechanical secondaries and it is by far the best carb for my car yet. I did have to do some tuning on it to get it dialed in, but it ran great out of the box. I thought it was running rich, but after a dyno pull found out it was lean, so went up in the primaries and squirters, gained 20+ RWHP and RWTQ and it is great.
Jim
