You're going to have to be your own "engineer" on this one. I'm sure there must be a huge number of municipal plow trucks in your neighborhood to use as patterns, but the basic idea is to install brackets in line with the frame rails to provide push points for the blade, and some sort of hydraulic system to raise and lower it. I've seen plows that attach to vehicles like Jeeps or 4WD pickups, so do some internet searching to get an idea what's available. Finding an exact-fit, bolt-on item for a 70 year old vehicle is probably going to be somewhere in the neighborhood of "Slim-to-none"!
Do you have enough length and width to the area you're trying to plow that will allow you to maneuver a vehicle the size of your truck without running off the paved area? If you have to get off into an unpaved area to turn around or push the accumulating snow from several plowings somewhere, it's going to look like a war zone once the snow melts in the spring.
Jerry
