Some pictures of Mr. Allen's cars can be found at these two ERA pages:
http://www.erareplicas.com/cars/page2.htm
and
http://www.erareplicas.com/cars/allen/index.htm
The first link has his GT40, 289 FIA and a 427. They are at the bottom of the page, 2nd row up. Click on the photo for a much larger picture.
David Lowell