Was a 350 engine available for 1986 El Camino?

No, a 350 cubic inch (5.7L) engine was not a standard offering in the 1986 Chevrolet El Camino. The 1986 model year marked the end of the El Camino's run, and the available engines were smaller, more fuel-efficient V6 and V8s, focusing on the era's emphasis on fuel economy. The larger, more powerful 350 was largely phased out of many GM models by that point.