My apologies, I didn't comprehend this is B-Body stuff.
My understanding is there are no aftermarkt stock height spindles for B-Body's. As a result if you want a brake kit for stock height spindles, things start to get a bit crazy. If you're looking at lowering the vehicle, you can get some of the cheaper kit's in 2" drop spindle options, such as this.
https://www.getdiscbrakes.com/fsc65sdds
You would then pair that with an appropriate rear kit that will fit a BOP rear end with bolt in axles.
This would allow you to run 15" wheels, which may or may not be a sticking point for you.
I believe that KORE3 has a Corvette based solution for B Body spindles, though you may have to change to a modern B-Body spindle to do so (94-96 Impala). They do mention they have outer wheel bearing instead of inner wheel bearing kits available. I would call KORE3 directly and speak to Tobin in he's available.
http://www.kore3.com/index.php
Problem with the KORE3 setup is it's going to be about double the total price and it's also going to require at least a 17" wheel (noting that not all 17" wheels will work) with the possibility of an 18" depending on the style.
If you want to keep the factory ride height and the factory size wheels, that leaves you with having to do some scrounging and fabricating or mixing and matching.
As I understand it, you may be able to use A body spindles and steering arms on your B-Body. However, you're losing spindle height and the steering arm is being located in a different area. This is going to screw with the front end geometry. If you chose to try this out, you would want to take measurements on total spindle height from lower to upper ball joint (as they actually rest in the spindle) and height of the steering arm mount in relationship to the lower ball joint. Utilizing tall ball joints you may be able to replicate the geometry pretty close (if not make it a bit better). That would then allow you to use an A body disc brake kit for which there is availability of lowered and stock ride height spindles in the GM short spindle or aftermarket tall spindle variety.
You may also be able to adapt 94-2001 F-Body brakes to the factory spindle, but you would need to fabricate caliper mounting brackets to do so.
Hopefully somebody with more B-Body knowledge will jump in an confirm whether utilizing A body parts is actually doable or not.