The 370 is a link coupler engine. The link couplers of the cars attach to the bars on the front or rear of the engine. The equivalent knuckle coupler engine is the 371, they are harder to find. There were many other GP7's made in different road names with knuckle couplers.
To make a 370 into a KC engine the two end rail assemblies must be swapped for the equivalent pieces from a KC GP7 engine. Then the two truck side frame assemblies need to be swapped for ones with the KC's attached. It is not trivial to get all these pieces for the swap but it can be done.
