Does anyone know what cam this is?

P4120653 0.528"/0.528" Lift, 284/284 Adv. Duration mech..?

MP cams were not all purple and they did not have the part numbers on the end either, usually just a contract number as they were made by whomever was making them cheap back then. They did not have a bigger than .508 hydraulic cam unless the site doesn't go back that far.