Timing for a 318

Completly stock everthing. But I think the timing is going, it sometimes backfires through the intake when I am accelerating slowly and hesitates when changing rpms from low to high. The engine has quit on me a couple times. So I need help on how to time it and to what specs. I am not familiar with this system.

I think it is to advanced, or is advancing to fast. While I am at it I may change to electronic.