I was searching on the Autolite 4300 Carb info after a response to my earlier post and I ran across this performance article from 1972 Stock and Drag Illustrated. They have the info from the AMC Performance Activities Department.. Thought a couple of you might be interested. http://homepages.ius.edu/STEVEN/amc/article.htm Ralph 79 AMC Spirit GT 401 Save the AMC's!