I have on the shelf an old unused 383/440 Magnum cam package and a Comp XE268H, but I would had liked to test something not so typical cam choice as those are. I always target at a rebuild for a little better performance

I am having for the 383 KB 400 pistons 10:1 CR, othervise the engine is having stock parts, manifolds, ignition, carb, etc. That Challenger has A/C and PDB, so I would need some vacuum for the brake booster and some torque on the idle for smoothly running the A/C compressor.

Without any numbers, hp or torque, or other clear facts like 1/4 ET's, it's a little bit difficult to evaluate, is the cam worth the extra money spent.

If Bob want's to keep the specs of his cam as a secret, let him do it. I am not claiming about it. Don't misunderstand. I just would like to know, how well those cams perform compared to a pure stock cam.