I've got a 1952 8N and want to use it to plow snow this winter. My driveway is gravel, goes down, makes a turn and then goes up. Total is about 250ft. With the big lugs on the rear do you still need chains?
Chains help in ice,not really much in snow,that is with a 4wd tractor with loaded rears,yours is not 4wd,right?,so I would get rears loaded and buy chains.,also figure out how your rear brakes/left/right,,can help get traction and steer.
Wheel weights, Which I just put an ad in the want ad section, even though too far for you, will help in the snow. Before adding the weight I would just sit there and spin the tires. The weight of the front blade will make the back on the tractor a little lighter. Fluid in the tires is another option. Chains will also help on a gravel driveway but will leave marks or possibly tear up a paved drive. You could also add a heavy implement or concrete block off the 3pt will help.
Basiclly is you don't have added weight on an incline you ain't going anywhere. If you get chains I would suggest the big ring chain. The small link chains tender to fall inbetween the lugs making them unless.