Dave -

I've got the same setup. The pivot bracket for the brake needs to be relocated. Mine is now on the section of the frame that was boxed. Maybe you can zoom the picture:

http://picasaweb.google.com/ChrisAurit/TruckBefore/photo#5036183517416508178


[b]1957 Chevy Big Window 3100[.b]

In the Stovebolt Gallery
More pix in Picasa

It ain't broke 'til you can't fix it any more.