Growing up in Kenosha more than 1/2 the cars on the road were AMC. True AMXs were the least common. Tons of Javelins, Gremlins and Hornets. The Hornet AMX was a joke like most of 70s and 80s cars.
The gearheads in high school usually shoved a 390 in the Gremlin. In 1980 that would be less than a thousand for the car and couple hundred for the motor.