Ash, how come no-one answers?
The Falcon and Mustang used the same dashboard binacle, so I'd say yes!
Check with John Tervena(sp?), they guy who imports US Mustangs to Oz and coverts them. He will know. As for me, the firewall gets section with Aussie XM-XP bits.
Keep in touch. We wan't to ensure you get help. It's vital you enjoy your project. I've been personally interseted, and I think you have a great plan for your machine.
Help him out, guys!