Which low deck intake are you using with standard port heads? (i.e. not max wedge)
Mopar Perf M-1 (single plane) Edelbrock Victor 383 (single plane) Edelbrock TM-6 (single plane) Holley Street Dominator (single plane) Weiand Team G (single plane)notches cast into the 3,4,5,and 6 runners to clear the intake bolts Other?