After spending hours and hours tuning my italian dual weber 45's I'm glad I did, Cured all my problems and learned a lot in the process, Latest was stumble under load in 4th and 5th gear at high revs, Thought was fuel pressure but I decided to check carb sync again and sure enough cured the problem, Not perfectly synced carbs cause all kinds of problems, Cured stumble off idle by going to 60 idle air jet from 50, Tried 65 but that was too much, Same with main jet started with 125 went to 130 then 135, Back to 130, Pulls hard all the way to 7500 . Last problem I'm tackling is my linkage which is IE early cable which is not very smooth or responsive so just ordered different style to smooth that out and I should be done. Tried finding locally a weber guru at numerous local shops, Crickets, Nobody would touch them. So anybody contemplating going to dual set-up be prepared to do it all yourself.