Try a custom chip with 18 degrees timing kicking up to 22 degrees above 4,000 rpm with LV8 255 (this gets rid of part throttle knock while allowing additional timing with alchy on). Have the alchy turn on about 12 psi. Use 100% denatured alchy. Tune ~800mv WOT fueling. I'm able to run 24 psi knock free with 91 octane pump gas this way.