I bought a wrecked 13 Camaro SS package from Midwest auto as the starting point for my 87 El Camino build. It was an L99 with a 6l80 transmission. Had Texas speed and customs do the prc head work and multi angle valve job along with an LS 3 cam and valve train set up. Had the trans built for 800hp. The Camaro package came with computers, radiator, steering column, gas tank, shifter, instrument cluster (19k miles on it) brake booster and all accessories (ac, steering pump, etc) on it also for $7500. I have another $3500 in the motor and trans build (parts only). It’s strong, turnkey package that made the process much easier for me. Doing it again I would find a 6.0 and a 408 rotating asssembly and save myself some money