6 pack, or 4bbl?

I'm porting a SB Mopar 6-pack. I've been told by a SB expert that they just port match and that's about it, also said the Mopar piece may be slightly better the the old Eddy. I'm going deep with the porting and using a 6" long bit along with 6" long tapered sanding rolls. The ports are not to bad as far as core
Shift but there is a lot that can be removed from the ports all the way in. The big problem seems to be the 90* turns I can kind of radius the high plane side of the manifold but the bottom plane will have to be done by hand with strips of sand paper and a lot of patients. All in all probably minimal gain for a ton of work! Plus side is I'm using the old DC mechanical carbs that flow closer to a true 1050 to 1100.

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