SURELY that '84 has electronic ignition.
If so, ignition dwell is a non-issue.

If it has points:
There is a relationship, but you can't substitute one for the other.
If your timing is just a couple degrees off, you could bump the dwell to
 a different value that would move the timing to the point you want.
But that's a kludge.

Basically, the dwell is the amount of time (in degrees of rotation) the
points are together. They need to be in contact for a certain amount of
time for the coil to saturate. Reduce that time, and the spark isn't as
hot. As soon as the points open, the coil dumps it's spark.  If you
increase the dwell time, it reduces the time that the points are open.
They could close before the coil dumps the full charge.

So as you vary from the ideal dwell setting at the expense of something
else. But it does change the  point in the cycle that ignition is fired.

If the dwell and timing were originally correct on a points system,
resetting the dwell after points wear or replacement should restore the
correct ignition timing. However, most electronic systems don't have any
wearing parts so the dwell shouldn't change.