After realizing the 68SS i purchased did not have a kickdown switch on the carb or on the gas pedal, I decided to start checking I.D. numbers on everything. The carb I Have is a carter #7044223.I know it was made in 1974 and the last number is odd meaning its for a manual transmission.My car is a 396/350hp w/a TH400 automatic trans. Whats the main differences between auto-carbs and man-carbs? do I need to do anything to this carb to continue running it? I just bought a rebuild kit-A GP Sorenson #96-577a.Should I even rebuild it? or do I need to find another one.