Its not a straight up swap, but you will need extra parts and pieces.
Take the SC motor, put the mustang motor mounts on it, bolt the tranny to it and drop it in. If its a standard, you need a 2000+ neutral balanced flywheel. If its an automatic, bolt the tranny up to it.
You will need the 94/5 mustang/SC timing cover, 94/5 SC balancer, lengthen the IAC wires, use a 94/5 GT throttle cable and TB (pretty sure you have to change the TPS sensor and plug as well), make a throttle bracket if you want the cruise control, bend one brake line off the MC, use the SC radiator/intercooler/fan if you want to keep it simple, and a tune.
The SC intercooler/radiator will work, but temps have shown to climb at 70MPH cruise. So a FMIC would be the way to go. 2.5" pipe is the good for almost all power levels.
AC delete is the easiest way, but lines can put together to have the AC working.
Use the SC radiator hoses and oil cooler.
Use the mustang MAF and you will need a 255 pump.
Also, a must is a dual exhaust or you will pop head gaskets.