correct connection? brush mower

The issue for you is the pto connection. The 8n does not have live pto so you need an overrunning clutch which fits on the pto shaft. To complicate things still further, I think the 8ns, or some of them anyway, had a smaller pto shaft so you will also need an adapter. The pto shaft on the 8n is lower in relation to the drawbar than on recent tractors or on IH, JD, AC, or Case tractors made during the 8n years. No problem with a 3ph bush hog, but I doubt the pull type pto shaft will go over the drawbar. Raising the 3ph hitch drawbar with an pto implement driven implement is an invitation to disaster even if it could be attached since the pto driven implements normally have a bracket to set the pto shaft at a certain height. I'll probably step on some toes here but IMO the 8n is too light for anything over a 4 foot bush hog unless someone is cutting short grass slowly.

KEH