So lets see if I can explain this right.

I am building a 1940 Ford Tudor Sedan Deluxe street rod. I want to use a Ford 9" rear end. What length should the rear end be made to if I want to use a wheel that stays inside the wheel well, and I don't tub the car? I want the largest possible offset to a wheel I can use. I like that look. I will be riding on air.

What is the majic rear end length, wms to wms?