It's the intake. They are very different in terms of performance capabilities. The RB intake is miles better than the SB unit.
Rob, This discussion was about SB's... OP's stroker 408... You may draw whatever conclusion you like to discredit the ACTUAL testing done between the SB 6 pack and Air GAP/Victor manifolds. It's not even close, 35HP was the number in the middle on the stuff I helped on.
If a person can't tune a carb to drive on the street, then a 950 likely it's not for them. Doesn't discount the difference in performance. Even a 750 will beat the SB 6 pack. BTDT :)
