I stopped by Dutchman motorsports in Portland today to drop off my axles to be shortened and found out they now make a beautiful 9" Ford IRS rear that can be adapted to just about any chassis and they are good looking and darned tough looking too.
They also offer IRS components like hub carriers, custom halfshafts, outboard brakes and mounting parts, bearings, etc...
Check it out at
http://www.dutchmanaxles.com
Alex, this might be just what you're looking for.
Price lists are also on the site. Hope this helps someone doing a scratch build- or changing out your rear end. They even come with Polyurethane mounts and mounting brackets and cross pieces cut long to be fit into your chassis.
Let me know what you think- Bob