I havent done it on a GT, but I did it last summer on an LX. It was surprisingly easy. The intake plenum along with the throttle body needs to be removed, but the intake manifold can be left on the car, just pushed out of the way. The exhaust manifold can be disconnected and just left there hangin out. But you may want to support it or tie it to something just to be on the safe side. The distributor can be left on, just make sure you disconnect all the elecrical connections. Undo the head bolts, and lift that bastard off. make sure you have the head checked out for cracks and have the bottom milled true. It took me and Kennymx6 (it was his car) about 4 hours to remove the thing, and about 7 hours to install the cam gears, seal, and distributor on the new head, and then install it on the car. It's a pretty straightfoward procedure. We used the haynes Ford probe manual.