Two. The other was built for Cosby:
"It'll have 'automatic shift,' don't hafta worry 'bout no clutch. I'm havin' one built for me..."
http://activerain.com/blogsview/1475714/bill-cosby-200-mph-its-a-real-car
Putting an auto behind 800 HP makes sense. I might guess the manuals back then did not handle that much power very well.