Mustangs look great but when buying an unrestored one you need to look for this. The cowl box is often severely rusted out. you can't see it from the outside. Teh damage can only be inspected by removing the fenders which requires removing the complete front end.
THE DISMANTELED STANG!
THE SOURCE OF THE LEAK!
There is alot of time work and money involve to do a complete and proper repare of this damage. I had niether time nor money. A budget job was performed for now.