Converting a '36 Ford to '37-40 steering gears can be quite simple if you have the right parts. If you want to retain the original light switch it is a little more difficult adapting the original switch to the bottom of the steering gear box.
I would suggest converting the light switch to a modern pull switch on the dash and a modern dimmer switch mounted to the floor between the clutch and brake peddle with a push button on the dash.
The conversion requires the frame mount for the steering gears from any '37-40 Ford. You will also need a '40 pitman arm, part # 21-A3590-3 015.
I converted my '36 Ford coupe to '40 steering box in 1952, it was like adding power steering compared to the original Gemmar worm-sector.