318 #302 head timing question

This is the number 1 mistake a lot of people make. They are told were to time the car, they set the distrib. to where they were instructed, and that's that! I've had performance machine shops, etc, etc, all instruct where to put the timing. Some have been close, but the E.T doesn't lie. I go up (or down) 3-4 degrees at a time to see how the car responds. If it likes it, I continue to head in that direction till max achievement is accomplished. Even trial and error out of town can help with this. Let YOUR car tell you what the timing should be....