make sure you haven't overlooked some vacuum leak.
is this a new unit(w/mounting instructions?)?
perhaps some crap in the idle jets, but it should still be able to run on the mains(sorta at least) w/ throttle open(i think).
these things are pretty simple, but initial setup instructions are important.
try this:
pull the idle jets to confirm they are clean( are you running a fuel pressure regulator?), jets probably #60?.
back out idle screw 'till off the throttle lever(w/choke off high idle cam), then screw in 1-1 1/2 turns.
gently screw mixture screw till it stops, then back out 2 turns.
if all else is good- it should run(probably idling high).
further adjustments would follow, but that should be close enough to know that it's working ok.