The firing order for a 1970 Camaro depends entirely on the engine it has. Camaros in 1970 came with a variety of engines (straight-6, small-block V8, and big-block V8), each with a different firing order.
You must specify the engine displacement (e.g., 250 inline-6, 350 small-block V8, 454 big-block V8) to get the correct firing order.