How can you tell the difference between a 1968 283 and a 327 engine?

To differentiate between a 1968 283 and a 327 engine, you can check the engine's casting numbers and the size of the engine's displacement. The 283 has a displacement of 283 cubic inches, while the 327 has a displacement of 327 cubic inches. Additionally, the 327 typically has larger intake and exhaust valves compared to the 283, which can also help in identification. Lastly, the engine's identification tag or code, usually found at the front of the engine block, can provide specific details about the engine model.