Just rebuilt 454 gen V, installed EMI Thunder alum. headers, victor high rise, 850 Dbl pumper and M1 Procharger. PC sez I have to run a 11.5 at exhaust (not to lean not to rich) I contacted a mech. that sez I have to have O2 sensor port installed in my new alum headers cuz the sensors can not get wet. Anyone out there know how I get my holley tuned in just right w/o jacking with my new exhaust. First time to work with a supercharger. Thanks appreciate any help you can give this Austin country boy.