I hooked up a vacum gauge to the intake manifold to set my fuel mix and the most vacum it would pull is about 15hg.I dont know what the norm is or anything about vacum.Never had a vacum guage before. Most of my mods are in my sig.Im runing a 302 .040,351W heads with oversize valves,hyper. flat top coated skirt pistons, Total seal gapless rings,Comp cams 280H cam,1.6 roller tipped rockers, Weiand Excelerator intake, and stock manifolds. I thinks thats all you need to know but if not what else do I need to put down?