The Firebird in the background is the one that Nicolai Lawrienco owned and drove. The engine consisted of a RAIV block with a RAV crank in it. With some other special parts on top, like homemade intakes. I think he had a bunch of them. My friend Nova67-Anders has some stories about that engine/car.
The white Charger behind the UFO Mustang is also a factory HEMI car. I believe Jan Suhr has it covered in his book "Scandinavian Muscle Cars".
I think I have an article about this El Camino somewhere but I can´t find it right now.
Last for this time is the Opel Manta FC the way it looked in the summer of 1976. It was soon after destroyed in a fire.