TOPIC: 1974 Music city Boat mfg Neptune 1 please help

I have a 1974 Neptune boat. I am looking for information on this boat but I cannot find anything. I am also running a 1973 50hp Johnson on it, which runs great. looking for any info i can find about this boat. Especially why there are 3 plugs in the back of the boat.
May be interested in bring back to original if its worth the time.

I use the boat for hunting that's why its all wrapped in camo.