Should I change my cam?!

no
yet another SBC grind
would be the better than the xe268
same cam series
you can check the comp website and find the intake closed point on their cams
but any of the 256 duration cams from Howard, Lunati voodoo or jones will have more area where it counts and close the intake earlier than the 256 comp cam
as I said comp as nothing under 275 that is optimized for a mopar