Lunati 60406 vs PurpleShaft P4452761

Asymmetrical lobes are not new like many think......
They are in my 1974 Isky catalog.....

Also, Comp had XE lobes for the 904 Mopar lobes. #5964. 275 adv, 231 @ 050, 0.525" lift.
XE Chebby lobe 274, 230, 0.488" lift.