New guy with some basic Dart questions!

Any of the above motors are good. I would say of the group the 383 is the one I would recommend the least. The expense to install it in a dart is identical to the 440 and you are installing a smaller motor.
The 340 will bolt right in with factory components and it is not hard to get the performance you are looking for. 340s are great and my favorite motor but prices for 340s command a premium and equal performance can be hadone by a well built 360 . They are more common.