Chevrolet’s fifth-generation El Camino, built from 1979 through 1987, had to survive an energy crisis that punished anything with a big V8, and it did so with a shrinking body, a maze of trim names, and even a diesel V8 option that saved fuel but earned a reputation for expensive repairs. Read on to find out how a car-truck hybrid balanced performance and economy through one of the toughest decades for American muscle.