I need a Chevrolet engines manual

I have problems with my pick up a few weeks ago they changed the rubbers or butties and continued wetting a spark plug that could have been swollen the rings and that this passing oil the engine was repaired two years ago but the heads are the ones that I brought the engine I removed made the conversion of 350 to 305 tbi. disarmed thanks to all ...

If the spark plug gets wet with oil or is a ring or it is a valve retain, but fortune teller we are not the mechanics and how they come together in the middle is mechanically impossible to know where the oil enters. If it is a ring, it goes adjustment or semi adjustment, it is the only solution,