look at the male ends they get week and corroded you may want to get new ones . if the heat from the wiring melting the bulk head the connectors are bad . take your time when doing this. solider all connector is best then use dielectric grease when you put together.
Their is so much heat in that area of these car's. The bulk head connector is just in a bad place. After working on this car and taking a run down the road and back lift the hood and touched those wires and the connector extremely hot. So after many year's can under stand why that area has problems. Wonder if some one makes a heat shield of some sort to go over the connector. While working on the car just rapped the fuel pump with exhaust rap. It was so hot you could not even touch it. Trying to stop vapor lock. Hope you solve your problem soon so you can enjoy driving that car again.