Was told when installing my new opti spark it would fit only one way, and when installed properly the timing would be set. Here is my concern, another vette owner buddy stated that "yes the opti go on only one way (but!!!) this does not insure that the timing will be correct." Car currently starts right up cold or hot, throttle response is good, it doesn't miss or pop. Can anyone clarify this?? Thks in advance for your help..