camshaft help

Has the car been to a chassis dyno? It would eliminate any shifting issues from the power question. Off the top of my head, I cant figure out why a stock 452 headed 451 couldnt pull well over 6K with a hydraulic roller. It sounds to me like it has another issue. You said the heads were ported by muscle motors..What stage did they go to? Both your cams are reasonable in size, so I'd think either one could get you faster, assuming the shifting was good. (I cant drag race a stick very well..so it's not meant as a bash..)