On a 64 1/2, the brake light switch is on the front of the master cylinder, like the one in the picture, instead of hanging on the brake pedal inside the car, like a 65. You will also notice that the engine gauge wire harness has a couple of extra wires coming out of the firewall for the brake lights, so, the 64 1/2s also have a different engine gauge harness to accomodate the brake light switch.
This is a picture of the front passenger side of the radiator core support in front of the battery. You will notice those three slots in it that look like gills. The alternator cars don't have that. They just have those four slots over to the passenger side of the gills.
The flap indicated by the arrows hangs down a lot further on the 64 1/2s than it does on a 65. On the 65s, it only comes down about half that far. From the factory, this part is painted black, as is the upper area of the piece that this flap is a part of from the front edge of the cowl lip forward. This one is painted body color just so it stands out better. Again, if I ever go back to trailered concours perfect, I'll also fix that.
Many of the 64 1/2s had a cast iron crankshaft and water pump pulley set-up. Here they are, sitting beside the generator bracket. The one in the middle is the water pump pulley and the one on the left is the crankshaft pulley.
The generator cars had these great big horns mounted down on the strut rod brackets, instead of the smaller horns on the radiator core support that an alternator car had. There was also a horn relay mounted above the voltage regulator on the generator cars, instead of a wire coming straight out of the turn signal switch and going directly to the driver's side horn, then over to the passenger side horn, like the alternator cars.
This is kind of a small thing, but, it was a 'better idea' from Ford. You will notice in the picture that negative battery cable is attached to the inner fender area with a clip and a sheet metal screw. The generator cars had this, the alternator cars didn't. Even if the clip isn't there, there should be a hole in the car for the screw.