?? cam change for using pump gas??

.030 383 dome trw's,stage VI heads,.528 MP solid. we cant use 93-92 oct,knocks bad @ 37 deg,mostly street car....sooooo anyone know of a cam,near the lift of 520-530 to bleed off compression,so we can run pump gas 93??? i really hate to change pistons,ect. sorry dont have a cranking compression right now. any help would be great,,,thanks,mike

Not what you requested but might consider retarding the cam 4 deg & exp w stiffer dist spring

I would look at running a thicker head gasket.