A long block is a engine that comes with the heads, and all the internals already installed (ie. crank, rods and pistons). Also sometimes, a long block comes with the upper and lower intake. A short block only comes with the internals (crank, rods, and pistons), but no heads or upper and lower intake. What year is the camaro? It's most likely a 5.7L 350 or if it's older it may have the 305ci engine......