rumblefish360 - The 750 CFM works, but having the WB opens a window into what is for real going on. In my opinion, a 750 CFM is good, but I think the 600 CFM will be better. At least for my engine. I can't tell you the specs on the engine. I took ownership not given the details. If I didn't have the WB and had it tuned it to where it is, I would have thought it was as good as it could be. The 750 probably gives me all the top end power I'm ever going to have with this engine as-is. But there's room for improvement on the street. And since that's going to be 99% of my driving, I'm looking for those improvements. Looking forward to receiving the 600.
I wound up buying the 1405 instead of the 1406. I'll save $31 and retain my manual choke. I can easily jet & rod to the settings of the 1406.