Um, I wouldn't try 120 Volts AC on that one. It has a ferrite-core transformer, pretty sure. Not meant for 60 Hz.
The base-station power socket might or might not match this radio. If memory serves, Lafayette didn't use the exact same power-socket hookup for every base/mobile radio they sold. Just a vague recollection. Could be wrong about that.
The reason for all those pins was to use jumper wires across them to re-wire the radio's power switch, along with feeding power to one set of pins for AC and one set for DC. Using jumper wires inside that plug saved them the cost of a "AC-DC" switch mechanism.
Finding out where each wire goes on that 8-pin socket is the starting point, I think.
ERRRR. Just noticed a slide switch on the rear panel. What is this switch marked?
73