Do you have the stock 273 in your Dart? If so, the register in the back of the crank is smaller than the nose on the front of the 68 torque converter. If you have a later small block in your Dart, that may not be a problem. If you do have the 273, you might have to get a new converter made with the smaller nose like a 65 converter would have had, and the proper splines inside for the later trans. If you ever swap to a later LA engine, the good news is that you won't have to hunt yet another converter. Someone makes an adapter ring to go from small nosed converter to larger register in the end of the crank.
