I for one don't understand how you can possibly run lean. I've got Edelbrock heads, a 75mm MAF, 1.6 rr's, E-303, Cobra intake, yadda yadda, with stock 19 lb/hr injectors.....and I run lean at stock psi (40 with vacuum), but PIG RICH at 45 psi with vacuum. My regulator is adjustable to..well...