Boyd---- Ford 9N who---yah, you are going back in time. What 1950 or so for a 9N.
My opinion and my opinion only, no way- not on a bet-- not to save my hide --- would I bush hog in heavy cover with a 9N. I might add that I have never done it on a 9N but I for danged sure have done it on an 8N, still have the nightmares.
Why?
Well 9N great little tractor, good weight to HP, it can pull like a demon-- but it has no live hydraulics and no live PTO.
What does that mean? Simply, for the hydraulic arms to lift, the tractor has to be in
gear with the clutch out. So picture yourself in heavy woods trying to cut, your bush hog is to low to the ground, fixing to hit a stump, in order to lift the bush hog over the stump you basicly have to be moving either forward or backward. In other words literally driving yourself into the stump praying that the lift raises fast enough to miss the stump.
I'll have to check to be sure but I don't think the PTO turns in nuetral either, in other words, clutch has to be out and tractor moving for bush hog to turn.
Other considerations, the transmission is 4 speed but the rear end is single range. So if you are bush hogging, to get 540 rpms on the PTO the engine is going to need to run some where around 2800 (if memory stands), at 2800 rpms in first gear your over the ground speed is going to be dangerous fast to be cutting in heavy growth where you can't see the ground or what is ahead of you. My experience with the Ford 4 speed is that 1st gear is to fast and second gear is to slow. But if you are cutting wide open pasture, it will do a good job.
Also, with a bush hog hooked on the back of that tractor, and your traveling across ground, with a sudden need to stop, good luck. The bush hog has enough kenetic energy stored in the blades to push the tractor ahead with brakes and clutch both down. IT WILL MAKE YOUR BOOTY CUT A BUTTON HOLE IN THE SEAT COVER!!!!!! You can get an "over ride clutch" that will prevent that. Cost about $60, fits on the PTO shaft. How it works-- basicly it only accepts power from one direction.
Now don't get me wrong, Ford 8Ns, 9N, Hundred series, 2000s, 3000s all were fine machines. What I am telling you is a 9N might not fit your need very well. It may cost a few more dollars to get what does fit, but you will only be spending your money once, and believe me you will be safer too.
Lots of those little CUT (Compact Utility Tractor) tractors out there, give'em a look see. Check out the grey trade Yanmars particularly the YM2000. Used Kubotas and such.
I can give you an invite to a "tractorforum.com"
or maybe a "mytractorforum.com"

but I am not sure of the rules here pertaining to referals

.