The Rover-Landers of BC

Changed from a single master cylinder to dual power brakes , type 50 booster with a d110 master cylinder, with this and disc brakes on the front and stock 88 drums on the back should I be putting a proportioning valve on the back brakes ? Does anyone have any experience in converting to power brakes and discs that could give me some guidance Thanks Troy

90s with drums don’t use a proportioning valve.

Is that disc on front and drums on the back?

Yes and the drums are identical to an 88.

Thanks