Farmall Cub

My Grandpa passed away and left us his 1935 Farmall F-12. Good tractor still and my brother-in-law attempted to switch out the plugs and wires. He got them all mixed up and need some help on firing order. If anyone can explain how I can get this correct I would greatly appreciate it. I am a city boy so I will need directions please. Thanks in advance.

Firing order is 1-3-4-2. #1 is the front of the engine. Firing order should be cast into the block somewhere.