New Dodge Dart Owner

Welcome. Sweet ride. If it has a 360 the torque converter should have weights on it for the externally balanced 360. Also check to make sure it has the correct externally balanced harmonic balancer. If it has a 904 and you wish to switch to a 727 they are different lengths (904 is roughly 4" longer) You can have the driveshaft shortened. It would be cheaper to buy a torque converter or send your existing converter in to have the weight installed.