In '61 I began tuning SUs on a Volvo, then in '67 to Webers on an Alfa, could not believe difference, Webers like working on a fine watch, turn the mixture screw and no question when you were at the sweet spot tween rich and lean, on SUs it s a cupla flats this way or that, lifting the pin to raise damper, maybe yes or no. Then on to more Webers on 330 Ferrari, SUs on TC, Elite, Jag, and Healey. Currently 5 SUs and 2 Webers under management. Weber once set stay that way for a year if not more, however if you live where summer and winter are diff temps they will need to be adjusted. SUs have jets to be centered, cork washers to replace, much less the unreliable float chamber shut off system, (replacing with Grose system cured that). All of my SUs except Elite had come with factory carbs, same true for Webers so all my tinkering simply to tune RIGHT jets. If you can find Webers with correct jetting for Healey they will be never be touched except for turning mixture screw and balancing screw. SUs harder to tune, more steps, and have other parts that give way. Six years of Alfa, One year of Ferrari, Eighteen with Seven and never had a gasket or part go bad. Jay, '65 3000