Not if it´s connected...
If it´s just there and one side of the old one is disconnected why not.
Paralleling them will give you the wrong value of capacitance and all issues you had with the old one.
If you have a "Hot Rod" (or any kind of modified ignition), you might want to consider one of my Big Brass "Trash can" condensers. The are built around a modern severe duty film capacitor and have "the look".