If I understand your question right, Rule #1 (Envelope Principle) is what you need to know and apply.

Simply state on your drawing that the drawing is to be interpreted per ASME Y14.5-2009 and then apply a limit tolerance from the left to the right side surface you wish to control min. distance and parallelism.

Rule number #1 Envelope Principle states that a feature of size tolerance at maximum material condition (Boundary) size defienes a 3D boundary that may not be violated due to the combined effects of size and form. Additionally, the limits of size dimension and tolerance will control the maximum parallelism as well.

If the limits is size total variability is +/- .010 then the feature will not vary in parallelism greater than .020. You can refine the parallelism to a greater degree by applying a parallelism less in variability than the limits of size.

What is the minimum distance required on your design as well as the parallelism?