You could convert to manual brakes or try to keep the hydroboost working. Or swap to a 94/95 setup. Getting ahold of a wrecked 94/95 V8 parts car will GREATLY help you out with this swap as you have to swap a ****load of stuff over. Harness, fuel, K, among other things.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.