@1Badcolt , my 318 currently is stock internally. D453 headers into duals, msd ignition with 2 med springs, 10 degree initial with 20 mec for 34 total. Eddy performer. Higher stall converter, about 2800-3000. 3.23.-1 gears with 26” tires. The street avenger carbs like my 670 has an adjustable secondary by changing springs. I can open it early with the lightest, or restrict it to about 50 percent with the stiffest. On a fairly worn 318 I still had great throttle response and decent mileage about 17-18 at 60-65 mph. All around good carb and very tuneable