Which side of engine is the rear?

Which side is considered the rear? Side with transmission or side with fans?

You didnt say which model of Dodge you have, or what kind of a car. Most always however, the 'front' of the engine is where the belts are, to drive the accessories; alternator, water pump, a.c. compressor. The 'rear' of the engine would be where it bolts to the transmission. Normally the #1 cylinder and #1 spark plug means the one closest to the 'front'.
I dont recall what they called the end of the VW beetle engines that faced the back end of the car, that might be the exception.