I was able to do Granada front assemblies for 415$ and that was with slotted/drilled rotors, powdercoated new calipers, ceramic pads, etc etc. but I saved some dough by having the spindles and caliper brackets already.

I believe some classics came with 9" rear rotors stock, but good luck finding some. There are plenty of kits.

Bite the bullet, and pay out the ***...

 

Look at http://www.mustangsteve.com/ and http://www.vintagevenom.com/ both you need bigger rims.

 

+1 on discbrakeswap.com

i bought their kit and the customer service was awesome, and if you tell him that your a member of the forums you get a discount