That chart is not relevant in the real world, especially with an adjustable secondary air valve ( AVS, TQ, Q-Jet, Street demon) carb. A TQ will run better than most any carb, followed by Q-Jet when done right. I've loaned a 750 cfm 440 Carter AVS carb a couple times on engines as small as a 289 and it performed so well they did not want to take it off. That 6090s TQ should be 800 to 850 cfm and that was the size TQ for OEM HP 360s. I run that carb on my 383 Formula S. Loosen the secondary spring a little at a time until you get a bog, then tighten it back till it goes away. What gears are you running.