I had the goose sound in my front end too.
http://forums.pelicanparts.com/porsche-911-technical-forum/956943-canada-goose-got-stuck-my-front-fender.html
Torsion bar was rubbing inside the tube. So last winter I dropped the entire suspension front and rear and completely rebuilt it. Good opportunity to rebuild the steering rack too. It's not difficult.
This thread was enormously helpful. Plus a few phone calls to Chuck and Shannon @ Elephant.
http://forums.pelicanparts.com/porsche-911-technical-forum/726309-78-sc-elephant-racing-suspension-rebuild.html
It was a (mostly) fun and rewarding process. I drove my car 5200 miles to Rennsport this year on suspension and an engine built by me. Pretty satisfying feeling. Good luck.