1997 Mazda 626 engine

I was trying to set the camshaft and crankshaft timing. What led to it was that my piston rings was replaced and after 4 days of testing the car, it refuse to raise when applying the throtle, so I checked the spark plug and saw oil in the combustion chamber. Then the top cylinder was removed and the valve seal was changed, so when fixing it back, the timing setting now became a problem because we dont mark before disconnecting. After trying your setting system (I' facing E') then we discover those fault I complained of. That is, seizure and not firing