How do you set a distributor cap for a 66 Buick Skylark 300 v8?

To set the distributor cap on a 1966 Buick Skylark with a 300 V8, first ensure the engine is off and the ignition is disconnected. Remove the old distributor cap and align the new cap in the same orientation, ensuring the rotor points to the correct cylinder wire terminal. Secure the cap in place with the clips or screws, and reconnect the ignition. Finally, double-check the wire connections to ensure they match the firing order.