Yes, they came later. Chevrolet Iran aka Royal was GM's Opel Rekord and was sold in the early 70s. It had a real potent 6 cylinder engine that would smoke anything on the road in those days.
View attachment 36405
Chevy Nova, Buick Skylark and Cadillac Seville came later. Here is the Buick. Very stylish still.
View attachment 36406
They were the last cars produced by GM in Iran and every bit on par with their US counterparts. The relaxing of the sanctions on the automotive segment has fueled the rumor of GM returning. Their plant is still there and running. I hope they come back and save the people from the hideous Chinese and low end cars they have to endure.