So I guess I need to fill in the blanks. 360 Cranks are same... so if you want to use factory balance.. the rest of the rotating assy needs to be magnum or LA . in other words if you want LA balance use LA pistons/rods/damper/flywheel, if you want magnum balance use magnum pistons/rods/damper/flywheel... if you mix and match have your machine shop balance the rotating assy they will need all the above parts.