9" drum brakes on a 8-3/4

Well 1st, IIRC, 8.75 housings are 5 bolt backing plates, and the 9 inch brakes all have 4 bolt backing plates.
And 2nd,those 9inchers are good for about 30mph/50kms.If you are putting in a 440, those teensy,weensy brakes could get you killed.
That car needs some serious brakes.Lightness be hanged.Discs on front and at least 10 inchers on the rear.Why would you risk your life like that? or your passengers?