Why would the bore need to be involved. Datum -B- is the minor diameter of the spline. This establishes a datum axis.
The center of the slot between the two larger tabs is the tertiary positioning reference. If the radius was manufactured in the wrong place, more than one of the dimensions relating to it would be out of tolerance. I'm still not sure the print doesn't contain enough information.
With the datums identified, and the basic dimensions provided, you should be able to produce the profile at the correct size and its correct location.
P.S.: Why did your drawing not show the datum feature symbols for the secondary and tertiary datums?
Best!
Stijloor.

