The 1973 El Camino was the biggest one Chevrolet had ever built, and it arrived carrying federally mandated bumpers that nobody had designed the styling around. Underneath sat a raft of genuinely thoughtful engineering: a wider track with deliberately mismatched camber for crowned roads, computer-designed coil springs matched to each vehicle, standard front discs, and a 22-gallon tank. Read on for what the fourth generation got right in the worst possible decade for performance.