For a while, Mark's articles were not online, but I found them again. He really knows his stuff as far as Webers are concerned. The jetting, tuning and transition info is applicable to you Dellorto fans as well.
He doesn't take any carb work any more, but this information is priceless as far as I'm concerned. Between Mark and John Connelly at aircooled.net they've got it all covered.
Cheers