9 1/4 brakes on an 8 3/4 housing

Some dimensional measurements from the Strange custom axle order form. I'm pretty sure that the brake offset is the same after the bolt pattern and center register diameter change, but I would measure what you have between the two first.
Axle Offset (Brake Gap) with Chrysler or Mopar Rearends Measured from outside face of axle flange to the outside face of the housing end. On Chrysler/Dana/Mopar type housing ends, F is obtained with the backing plate and gasket installed or combined thickness accounted for. If aftermarket disc brakes are being used then it’s best to remove the axle bearing and supply the B dimension to ensure proper fitment of axles. Chrysler/Dana/Mopar common F dimensions: 2.3125, 2.423 or 2.673