With the solid lifter cam I would use the Mopar stock ones like I have out of OEM motors, you could buy a new Mopar Hi Po one that is pinned if that will make you feel better The motor(cam gear) doesn't know that the blower is putting any additional strain on the oil pump drive(it isn't ) Are you using a stock type oiling system or a milidon external oiling pickup system? If so and it is a dual line with the adapter plate between the pump and the block you need the longer Milidon shaft with the longer shaft to drive that type pump