Has anyone compared the Edelbrock 600 Performer carb to the 650 Thunder AVS from a performance standpoint?

I had the Performer 600 on my 350 and changed to the Avs 650 and it was like night and day. Definately worth the money IMO. The ability to tune the secondaries is nice also.

I just put a 650 avs on my 406sb. Very streetable carb. Ive been playing with the secondary adjustment all day. Not sure if I should put it back to stock specs. I keep breaking third loose kinda spooky!