biker has got a set of 36mm Mikuni flatsides that seem to be the ideal carb for a 790 setup, maybe even good enough for the 904s. He bought two carbs, made a simple bracket to secure them together (a opiece of angle iron with 4 holes drilled in it) took all of 15 to make this. Then he made a new throttle cable with a 2 into one adaptor and away he went.They fit perfect and are outstanding quality.
I have tried the 42mm Mikunis,( way way too much gas for the 790s) the new 38mm Amals (pissed gas everywhere but otherwise a fine carb

) and will probably either get the ones from biker (he may go to a smaller size after all) or make my own set of the Mikunis up.
Edlebrock would be fine, as are the S&S (but aren't they really Mikunis in disquise?) and there is a guy over in Spain I believe, or maybe Italy, that has built some fine custom setup with the carbs with the variable accelerator pumps. Can't remember the name, but a search should pull the post up.
Now, what's the best oil?
Seriously though, we (me and biker) have discussed at length about dialing in the Mikuni setups and maybe offering the plug and ride setups for sale. Any interest?