edelbrock vers mopar alluminum heads

That replacement cam that mopar makes for 340's is not close IMO to the original 4 speed cam. Much bigger from a duration at .050 standpoint

manual cam, the 340 auto exhaust lobe on the intake and the 440 magnum exhaust lobe for the exhaust to end up with 276/284 .444/.453 - Duration at .050 was in the 212 int 220 exh range