Mopar P4452761 Camshaft

1969reddart said
According to the paperwork that came with my cam, the duration is 220/224 @.050"

aaronk785 said
Should be about right. I don't believe in super duper cams with stock heads. My 68 dart 340 9.5 comp. 3.55s and stock converter rpm intake and 750 dp. MP 280 474 ran 13.1. Went to a voodoo 276 234, 242 at .050 .513 and .533 lift no other changes 13.1, Then hughes 237, 243 at .050 and .538 and .542 lift solid 13.05. Ported heads might be another story.

More gear and converter, that's what that is telling you. The last cam just accentuates it.
It's not all about lift and if the head flows more or less...its about shifting the torque higher up in the rpm band and YOU not compensating for the loss of torque down low that keeps those 60 ft times down...gear and convertor.
Back on topic, people mostly don't really like that camp because it's barely better than a 340 cam and when you spend $200 and pull your engine apart, buy oil ,break the cam in... and barely feel a difference in the seat of your pants.... yeah people didn't really like that cam much.