hey guys: Anyone done any work on cleaning up airflow/turbulence on mid/late 60"s B bodies?

I cannot help but notice the front of the K member area catches air badly as well as other areas.
Not finding much info.
May start another thread for the late 60"s b bodies and one for the A bodies through mid 70's.

from about 70 mph up these areas certainly, effect et/mph so i thought I would ask if anyone has worked on reducing air turbulence /drag.

Thanks