Another thing to note - maybe not mentioned before is when going NA with quad carbs, bike carbs have one another advantage of a more direct flow path than webers designs when used on an A series. If you look at webers, solex-mikunis & dells, they can be made to work amazing with an A yet there is definitely more bends unlike some compact bike carbs.
Bike carbs seem to be easier for different choices of air filters, lengths and angled designs as well as cheaper, lighter and need less room in our small bays.
Heres a nice r1 setup not tuned yet
http://www.youtube.com/watch?v=Hy9xZZtg5Aw

heres a nice 1200 36hp beetle that doubled its hp with simple supercharged setup single carb look as his many vids where he tries different single carb design and layouts.
http://www.youtube.com/watch?v=-1WPxAKgNlM
http://www.youtube.com/watch?v=eUuDKGd1mVE
http://www.youtube.com/watch?v=YBwkugoBPq4
http://www.youtube.com/watch?v=hg7umXODtjE