I’d buy the QF Brawler if you can get one and I’m not sure you need a 750. I live where it gets cold in the winter and I never, ever use a choke.
I just looked at your OP and I’m on the fence about the 750. I don’t size carbs based on CFM rating. I size a carb based on venturi and throttle blade size.
If you didn’t have W2 heads I’d say to run a 650 based carb. So the heads shove me to the 750 based carb. But...the single plan intake shoves me back to the 650 based carb. I’ll post a link to the QF carb sizes and CFM ratings.
Even with the 3.90 gears I’m still leaning towards the 650 carb.
The QF Brawler 650 is a 1.250 venturi and a 1.687 throttle bore. The 750 is a 1.390 venturi and a 1.687 throttle bore.
The difference in venturi diameter is a big deal, especially for a street or street/strip deal. I run a 1.375 venturi and a 1.750 throttle bore on my 340 but I’m 11.77:1 and I run a 4.56 gear so I can pull that bigger carb. Plus I have a stick. Converter is a big deal relative to carb sizing.
Well, for now I’ve convinced myself you should stick with the 650 based carb. On a flow bench the 650 will easily flow 750 CFM plus at 20.4 inches of water.
EDIT: forgot the link...the Brawler carbs are on the last page. Study the diameters of the venturi and throttle bores before making a decision.
http://www.quickfueltechnology.com.au/content/Quick Fuel Carb Size with details-AUST.pdf
