What NGK number are you running? I have a stock LA 360 with a Purple Shaft .484 cam. 4200 stall, 3.55 gears 750 vac. secondary Holley, Air Gap and it runs 7.5's in the 1/8th. with Autolite 65's now. What NGK do you think will work? I have ran a 440 up until now.
