It may be model 06-42ST06 or like it. You can download the operator manual fromhttps://lookup3.toro.com/request/request.cfm
Enter the model number and type the word none in the serial number box. That will show you how it hooks up.
It requires a front quick hitch you may not have. You should be able to get one off a newer tractor and weld a piece of flat bar on each side so it bolts to the sides of your frame.
The snowthrower your tractor takes came in 2 pieces. The basic thrower and a completeing kit that mounted it to the tractor. The kit for yours was 6-9112. Go tohttps://lookup3.toro.com/partdex/index.cfm?xCaller=Toro
Enter 6-9112 and it will show how it was mounted with a long through bolt through the frame and a couple of bushings.
Make sure you get the lift tube and the what everyone calls the flag. These are what lift the snowthrower off the ground.