I recently traded a tired out jeep for a decent 79 Z28 with a previous engine rebuild. I believe that the car has a performance cam. I'm thinking that the timing chain may be off a tooth, I'll have to check. The Haynes manual says to line the dots up (this is normal) The Chilton manual says to line the dots up, but to make sure that the cam shaft gear's dot is pointing torward the top of the engine. I'm real confused with the different information. I normally line the two dots close together and life is good. Am I not thinking this out or are both ways correct????? Any help is appreciated.