Nice looking steel body!

Another resource is the Hot Rod Works http://www.hotrodworks.com . They have several brake and axle options and they have a reputation for doing good work.

With the quick change you must run coil overs (coil springs over shock absorbers) or, for the traditional look, a Model A spring. This is because the quick change projects back into the space the stock spring occupied. If you run a stock gas tank you may need to modify it a bit for clearance. I note that a lot of people who run quick changes put the gas tank in the trunk (bonnet) because they want the unit to show.

Posies http://www.posiesrodsandcustoms.com has the spring and crossmember. Pete and Jakes has the brackets to mount the spring to the early Ford axle tubes and also offers ladder bars, the traditional way to locate these rear ends.

There are two types or sizes of quick change rear ends. The smaller is called the "V8" and uses the gears and axle bells fron the 32-48 Ford automobile axles. The gears are good for at least 200 hp. But the axles use a woodruff key and they have a reputation for shearing. And the brakes are not impressive. The Hot Rod Works can build you a V8 quick change with modern axles and brakes and they can fit the spring and ladder bar brackets for you. The V8 quick change is the traditional set up for hot rods.

The larger quick change is called the "Championship" or "Champ" and it is based on 3/4 ton truck axles. They are stronger. Both Dutchman and Winters offer these quick chane rear ends set up with modern axles and brakes. The Champ quick changes were (and still are) used in racing cars and it is not unusual to see one fitted to a street rod.

Good luck! Keep us posted on your progress.