As a way to make the Survey Foot DGN’s reference correctly into a DWG file I have the following work around.
The difference between a Survey Foot and International Foot is:
1 Survey Foot = 1200/3937 meters = 0.3048006096 meters
1 International Foot = 0.3048 meters exactly
Therefore the difference between them is:
0.3048006096/0.3048 = 1.000002 sf/ft
Or 0.999998 ft/sf
So when you reference a dgn into autocad set the scale of the reference to 0.999998 and it should match.