#1 on the distributor cap is, if you are standing in front of the car facing the engine, at about the 1:00 position. This is the FACTORY location, very convenient to keep so that when you look at a diagram it will match, but it's not gospel. As long as the rotor points to #1 when the engine is at TDC on the compression stroke you are fine.

Cap window faces approximately 9:00 from the same location.

#1 is the front cylinder on the driver's side.