If i were u id go 4.6 gt. However u would need the harness for the 5.0 probably a k member ecm and couple other things im probably forgotten if u plan to go that route. Im sure others will chime in
1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.