Theres a timing mark on the pump drive hub..
I've never installed 1 of "those" pumps to an engine, so I cant tell u what your looking for on that part..
BUT I would assume u have to find #1 compression stroke on the engine & then line up the timing line on the pump..??
Did "U" replace the throttle shaft.?? or did u take it to a shop.??
I would remove the side cover on the pump to determine which cylinder they're using for #1..
It "looks like" they might be using that blanking cover as a timing cover.?? {in front of pump}