The 351Windsor and 351Cleveland will both fit in this car, which do you have??.
Both will fit on stock 79-93 Fox chassis 302 mounts as long as this car came with a 4cyl or V8 originally, if it came with a straight six you will have to mod the crossmember, I'm not sure about differences if it had a V6.
You will need either a Fox-body specific 351W or 351C swap pan and oil pick-up to fit the chassis depending on which engine you have. Headers will also have to match either engine and the Fox chassis.
The rear to get that is plenty strong enough and a bolt-in is the 8.8" Ford out of a similar bodied Mustang GT or V8 LX.