just make sure that none of the printle caps are broken, and if any of them are, take them off.
they don't have to be replaced, just removed.
also make sure that the two o-rings are put on the injector, and that there are no extras still in the intake manifold.
there is one large o-ring, and one smaller.
it is obvious where they go.
and you might as well replace the connectors while you are at it, the fuel line that goes from the injector to the rail.
(make sure that you use 5/16 fuel injection hose, because carburation hose will break off on the inside and possibly gum up an injector(s) )