Gotta love Ford.... Congrats on a well kept vehicle!!!
Indeed, they will run for a long time if they are properly maintained and not overly abused. (The abuse is what killed the only FoMoCo engine I have ever had to fail and even after it blew I still was able to limp 3 miles back home with it clattering and smoking the whole way. )
Keep it going long enough and your story may be valuable enough to Ford that they will award you a new Mustang for it and put yours in their museum.