WANTED: 1980 ford 8.8in axle

I need an axle for my car that can handle power, and my 7.5in rear end won't cut it.

What exactly I'm looking for is a rear axle that will fit the early ford foxbody car (1980 mercury cougar xr7) a bolt in 8.8in rear axle that is compatible with McPherson struts (3.55:1 gears if possible, but doesn't exactly matter)

If you have anything that you would like to sell to me please let me know, my price range is $100-$400, or $500 if necessary.

obviously with the year and price range I'm looking for something used, but please don't sell me junk.