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I wouldn't worry about dielectric grease there. Its really for additional insulation on the high voltage wires - spark plug and coil wires. In theory it should help seal terminals like you just cleaned. But my own observation has been that its not that effective a moisture barrier in that type of situation.
When you get a chance, do the same cleaning to the bulkhead terminals. Its a bit more time consuming because you have to keep track of the wire and cavities, etc. Make a drawing and take some photos. If the foam seal is shot, DMT makes and sells new ones.
The most critical ones in the bulkhead are the other end of the fusible link (battery feed) and the heavy black wire (alternator feed). The alternator feed carries all the current for running the car, plus any current needed for recharging the battery.