Yep, 180 degree twin they sure are. You cannot ditch the dual coils for the single, because otherwise you would ignite the fuel charge on its way into the cylinder. The timing doesn't work out.
You can, however, upgrade the coils, leads & plugs for more modern items. I highly suggest this, as it makes the bike easier to start and more willing to rev, especially higher in the rev range.
Cheers - boingk