Where is number 1 on distributor 305 chev?

On a distributor for a 305 Chevy engine, number 1 is typically located at the front of the engine, aligned with the driver's side cylinder head. When setting the timing or installing the distributor, you should position the rotor to point toward the number 1 spark plug wire on the cap. This corresponds to the first cylinder on the driver's side, which is the front-left cylinder when facing the engine.