1. I use 3.55 ring&pinion conversion gears in the rear end and can cruise at 60-65MPH all day. I find my original brakes to work fine (ALL new parts in the brake system and front end and in front/rear suspension).
2. Post photos of what you have, as suggested by Tim, above.
3. Running boards are the same as on all 1/2 ton Chevrolet & GMC trucks from 1947-1955.
