I have already cheated and found out the day you posted it. Was waiting for someone who actually knew it to get the win.
But since it's going unanswered I will divulge my findings. (I love getting to use divulge in a sentence)
VERY interesting and I vaguely remembered they did this but didn't know it was a different division of AMT the model people.
It was actually AMT Speed and Custom division! It was basically full scale model kits! They were kit cars! I love this stuff!
Piranha & Man from U.N.C.L.E. Car - Piranha "Roots"