A method and enhanced connector guide block structures implement robust connector assembly including robust Surface Mount Technology (SMT) connector assembly. A connector guide block includes a printed wiring board (PWB) mating face including at least one mounting screw hole provided within a mounting portion for receiving a mounting screw. The connector guide block is assembled with a printed wiring board (PWB) by inserting a respective non-bonding screw through an aligned opening in the PWB into guide block mounting hole and a gap is defined from an upper surface of the PWB below the guide block mounting portion. The gap is filled with an electrically nonconductive underfill material and cured. Another connector guide block structure includes an upper connector guide block portion and a lower connector guide block portion with a gap between the guide block portions filled with a selected electrically nonconductive underfill material and cured.