If you cant see a stream of fuel squirting into the side of the venturi, you have a pump issue. I cant fathom (see last sentence) a plugged squirter as the pump arm would show no movement, but if you have a linkage issue, then maybe. The pump squirter is located right under the choke flap (front) and is a round dealy with allen head bolt. There is a physical black tube (see figure 25 in link) connecting the pump well to the shooter that may be disconnected inside the top plate. But a dead lean spike on acceleration and no spray is simply a non functioning pump circuit. The pump rod itself is spring loaded so if the rod is moving, that is not proof the the piston is moving in the bore.
http://static.speedwaymotors.com/pdf/91012017.pdf