Is $650 for a rear end that you don't know the condition of or the gearing worth it to you?
Most people swap the parts because they already have desired gearing and/or a rebuilt differential. The housing is the same as the 94-98 cars so why swap good with unknown when you can just put the axles and brakes on.
94-95 8.8 is really the only direct bolt in rear. By this i mean the brake lines are run across the rear axle and there is a center hook up. 96-98 cars run the brake lines to the body off the calipers, so you will need to fab up the brake lines before installing the rear.
94-98 is also your only option. 99-04 cars are WAY to wide for a Fox and will add about 1.25" to each side over the stock fox track. If you use it, rim selection is key.
So up to you what you want to do. Swapping to COBRA disks can be done pretty cheaply
$50 = use 94-98 axles
$175 = M-2300M kit
$25 = 94-95 brake soft lines from rockauto
$50-75 = used SN95 caliperss
$5 = brake line adapters
$5 brake fluid
That is for the 11.65" vented disk brakes.
The gt/v6 come with 10" solid disk brakes...which IMHO suck major ass