[Roadsters] adjust dizzy

[oliver]

after seeming to run just fine a few weeks, my roadster (early 67 1600) 
seems suddenly to be way off.

i say this because when starting it is hard to get going, and then idles 
very, very roughly, with ocasional backfires through the carbs.  note: i'm 
still in the process of assembly, and don't have the choke cables hooked up 
yet.

but in the last two months i've been "exercising" it on a regular basis, and 
it appeared to be running just fine.

it has a philips screw on the base, and this was set full advance.  i set it 
to full retard, and that helped noticably, but i'm still not there.  before 
i did this, it would just barely run, and feathering the accelerator helped, 
but only to keep it running.  it didn't get and acceleration.  now i get a 
little acceleration.

i looked at this diagram,

http://www.311s.org/tech/parts/03Electrical.pdf

but i am still confused as to how to rotate the distributor.

or is there something else amiss that i am overlooking?