When talking about that first washer or spacer that sandwiches between the cam and the cam gear, there are two things to watch for.  First the washer should only be 0.004”-0.006” thicker than the thrust plate.  This difference determines the camshaft end play.  The second thing to watch for is the chamfer on the ID of the washer.  This chamfer is only on one side of the spacer and must be facing the camshaft or rearward.  If the ID chamfer is facing forward, then there’s a good possibility that the washer will not fit flush on the face of the camshaft and will create a situation where there will be too much camshaft end play.  That will cause other problems once the engine is running.