From the first picture I agree with your posted serial number.
#2 - tells me you have an 8N center front axle, radius rods
and a side mount distributor.
(and some more things to fix, but you'll get to those)
#3 - 8N rear axle, hood and dash with proofmeter for side mount.
#4 - besides the dash, the spin off shift knob and pedals agree
with a later style 8N from what I can see.
#5 - placement of the oil filler tube and what look to be home
brewed alternator brackets, among other things, makes me
think this was a 9N block that was converted. 8N Starter/solenoid.
#6 - Timing hole looks to be home/shop done too. Not original.
Oh, and you have an exhaust leak.
Maybe others will see things I missed.
I'll bet it turns out to be a great tractor with a little TLC.
#2 - tells me you have an 8N center front axle, radius rods
and a side mount distributor.
(and some more things to fix, but you'll get to those)
#3 - 8N rear axle, hood and dash with proofmeter for side mount.
#4 - besides the dash, the spin off shift knob and pedals agree
with a later style 8N from what I can see.
#5 - placement of the oil filler tube and what look to be home
brewed alternator brackets, among other things, makes me
think this was a 9N block that was converted. 8N Starter/solenoid.
#6 - Timing hole looks to be home/shop done too. Not original.
Oh, and you have an exhaust leak.
Maybe others will see things I missed.
I'll bet it turns out to be a great tractor with a little TLC.