I can't read the print. I would rotate the exact degrees to straighten the part out in the Demon, and check it manually using a Sine Plate. If that's what your asking. And if DAB is your FCF, Datum A would be on the angle of the sine plate.
Not on the Plate, you want it to be up so you can Zero. You need Datum A to be Flat, so it will be basically upside down or backwards. and the angle the blueprint calls out.
Then technically it should be DBA? If that's the case, Then D is on the plate. A on the Backing. Run an indicator over B. See how flat it is at the perfect angle. On Dmis you put the nominal number. if you use actual number, part might check good and nominal number it actually might check bad. This is not my call nor do I know the function of this part, and I still can't see the print.