I bought an ARP HD oil pump shaft.I assume the washer that stops the shaft from pulling out when the distributor is removed goes at the top of the shaft where the block narrows down.With the washer at the lowest it will go against the thicker part of the shaft the oil pump will NOT bolt up to the block.In other words its still not in far enough by about 1-2 inches and the washer cant be moved any further.On the original shaft is the washer at the top under the distributor or at the bottom near the oil pump?The washer on the original is bigger than the ARP one and will NOT enter the block at the bottom because there is a slight shoulder about 2-3 inches in.It will go in enough to bolt up the oil pump and not pull out at the top.Has anyone else had a problem with the replacement ARP shafts?