So, it's now a V8?
I'm working on this using the stock hub, an Infiniti rotor and a GM caliper, but it probably shouldn't be used on a V8 car because it's only a 10" rotor, yet extremely beefy. It may work for a mild V8.
http://pages.prodigy.net/al.martin/DB3.jpg
http://pages.prodigy.net/al.martin/DB4.jpg
http://pages.prodigy.net/al.martin/DB5.jpg
His best bet is to do the Granada swap. You get 5-lugs and a nice large 11" rotor. Here's some info on the swap
http://www.texasinternet.com/~dsigns...c%20Brakes.htm
To be able to keep the existing tie rods, you can use these bushings
http://www.geocities.com/mustangstev...dbushings.html
The control arms for the 6 vs. 8 are the same, as well as the strut rods. The spindles and all steering components up to the steering box are 6cyl specific. The steering box itself is the same as what came in the V8.
Another way to go is to get a pair of V8 spindles and purchase a V8 disk conversion kit. But then you need to swap steering components.
The Granada swap includes spindles and may run $300 - $500. With the bushings, you don't have to change steering components.
A Wilwood kit is about $500 - $600 using stock V8 spindles.
The SSB stock disk brake conversion kit can run up to $1000.
After I finish my 4-lug kit, I'm going to do a 5-lug kit. Camry and Mazda rotors have the same 5-lug pattern as the Fords, so I'm going to use a V8 spindle and drum brake hub, slide the Camry/Mazda rotor over it and make a bracket for the GM caliper.
Why GM??? They cost $15 each; they are readily available; you can get many different types of pad compounds; other companies such as Howe and Wilwood make performance aftermarket replacement calipers; many racers use them; they are rated much better than Ford calipers (sorry guys, but it's true); and did I mention they cost $15??
Al