As I was refiling the N337 drawings I found this General Arrangement. It adds sections and the additional information as to the name - Supercruise Fighter Air-to-Air baseline, the configurator, Tom W. and the date, which appears to be December 1978.
Concerning the A-18. As you know the designation F/A-18 recognizes it's capability in either role. If on an attack mission you are jumped by enemy fighters, you can jettison the bomb load, hit a switch and convert the avionics from A/G to A/A and become a fighter with two Sidewinders and a gun for self defense. An A-18 would have the same capabilities but be fitted with FLIR (Forward Looking Infra Red) and LST (Laser Spot Tracker) pods on the sides of the inlets as shown on the model.
How about the Night Fighter? A golf shirt from the (unsuccessful) Israeli sales mission.