Project 3.4 Camaro

Using the 3.4 serpentine belt setup, and was told if I removed the AC it would not be the same length belt as a non AC equipped car from the factory and thus a different length...can anyone confirm that, and or tell me how to best route the belt and what length? I't does not have a tensioner and I am not quite sure how to get the ideal length that won't have slack in it.
Also for the same reason I need to figure out how to use the alternator from it, the connector has 4 pins vs. my old 2 pin connector.