This 1968 Camaro is running an engine that didn’t exist when it left the factory — a ZZ4 crate small block bolted beneath dripping-wet custom paint and polished Torque Thrust wheels. Here’s why builders keep skipping the era-correct big block for a modern crate motor, what separates a resto-mod from a numbers-matching original, and why the first-generation Camaro remains the platform builders reach for most.