Another good source of a frame mounted differential and independent rear axles is a Toyota Supra. They're capable of handling 600+ horsepower, and they're not as hard to find or as expensive as Jag parts.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!