lets put it this way... you have 4 possible outcomes...

1. If im wrong with low timing, and you leave xx horsepower on the table and your car is crazy slow, and *****es are never gonna want to bang you.
2. If im right, and you run low timing, you dont blow your motor up, and your car is as fast as it can be, and *****es love you.
3. If Im wrong and you run high timing... All the *****es love your horsepower, and your headgaskets/other things will maybe break.
4. If im right and your still run high timing... You are gonna have a bad time, and you are going to have to fix something.