Don't forget, the firing order is casted into the intake 1-2-3. #1 is at the front of the engine and it goes to #1 on the distributor. Counter clockwise to #2 from there.
You should get a manual for your tractor.
You want an I&T FO-41 manual.
Also available from Yesterdays Tractors or any place like Fleet Farm, Tractor Supply, etc.
The distributer on those are both vacuum and mechanical advance and there is a specific procedure for timing one. The timing marks are on the flywheel. There is a little cover held in place by one screw on the block plate below the starter.