I use a Monarch underhood powerpack - lots of room under the hood on one of these "antiques"! Not visible in the photo is the second battery, though you can see the cables running across the top of the rad support.
Wire loom and fittings salvaged from "donor" vehicles keeps the plow light wiring tidy.
Showing the plow hooked up - the swing plate on the bottom of the bumper ties up out of the way with a bungee cord when the plow is installed. The bumper/plow mount and much of the plow A-frame is a "homegrown" creation.
Admittedly my setup is pretty old-fashioned as far as installing/removing the plow, but since I tend to put it on in November and take it off in April easy on/off isn't an issue.