The NHRA port volumes are really more used to determine the limit for how big they can be after porting in SS. If you start checking the runner volume of unmodified 318 heads you find most are well under the 162cc limit. Since you won't be porting them, they will just be whatever they are.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
