the mopar "284-.484" cam would be a definite no-no. a D.C. sixpak cam is the same as a stock 4bbl magnum cam as far as valve timing and lift and i'd say ok to that. the biggest problem i have with any of the small comp cams hydraulics is the 110lsa and 4 degrees advance no matter what flavor you buy. the 268/276 comp cams may be ok but i'd want 112lsa and no advance ground into it for starters. the summit 6401 surprisingly does have fairly good low and mid-range torque considering it's definitely more cam than a stock cam. i'm at a point in life where i lean more and more towards the gentler cams for something to drive. i've thought about having a comp cams cam ground with the 276/.464 lobe on 112lsa -113lsa to replace the mopar 272/.455 (also thought about a 276/284 @ 112lsa for a street performance cam). howards lists the intake lobe of the summit 6401 so a single pattern cam could be ground (this would be something like 280@.006", 224@,050", 133@.200" lift and .466 lift) on a 112lsa and make a nice driver.