I have seen some groovy 60's and 70's American classic and custom cars in Zurich and would like to use them in photo shoots. Does anybody know if there is a club I can contact?

Here's a list of classic car club websites, most of which are located in Switzerland:

http://fine-classic-cars.ch/clubs.php

Hope that helps you.

You can also try contacting Oldtime im Sihltab club, the main man there is Bruno Syfrig who runs the tyre shop in Adliswil.
Here's a link, Bruno is the chap pictured in the car on the website header. He's a top bloke and he speaks english in case your German isn't too good:
http://www.oldtimerimsihltal.ch/

thanks for this its a great help