The problem with the 400 and 3pt pto equipment like snow blowers and bushogs is you have to adapt the third arm either on the tractor or implement because the third arm bracket goes over the pto on the eagle hitch large frame tractors. This goes all the way til the comfort king and standard 3pt. It is not hard to do and there are plans available. I usually just raise the third arm on the implement and use the upper third arm hookup above the pto housing. Has always worked for me. Also those older cases are not great starters for snow blowing, you will need a good heater and batteries to get it running when cold.
That said, they are a great and reliable tractor and would do what you want.