I am replacing the timing set and have run into an issue. I aligned marks on sprockets and had #1 at tdc. I didn't remove distributor but I decided to check the location of rotor before completing the install. With timing marks aligned the rotor is pointing at #4! If I position rotor at #1 the timing marks on sprockets are 180 out. Am I missing something here???? Any info will be greatly appreciated. Thanks!!!