Just for my education.

Is the needle/seat change for a possible aeration issue?
I am trying to gain some understanding of when you know which variable to change. I have read a lot of Mark, Tuner, Dwayne and Thumper along with hanging out a little on SpeedTalk trying to take some of the theory and make a practical application, so I appreciate the help and patience.

'75 Plymouth Duster
Phase I 451 906/590/2-660 10.75/126
Phase II 451 Stage VI/590/1050 9.82/135
Phase III 383 906/Victor-Pump gas 11.30/119

"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"