drop spindles
BEWARE of the change in track width. If your using aftermarket with big ball joint A arms your track width will increase by around 3/4" on each side. This makes the wheels sit out towards the lips and causes all kinds of issues with finding the correct back spacing for wheels.
If you go that route better do some measuring before you order anything and be prepared to find that many manufacturers will not be able to supply what you need.
Steel rims may be different but alloys will be a beech.
Notice 72nblus wheels and how far they stick out on the sides. He cannot lower his car any more or the tire will rub.
The track width does change going from SBP brakes to LBP brakes, that is absolutely true.
But I want to correct something you said which is
completely incorrect. My wheels stick out that far because that's where I put them, it's not because of the additional track width of the LBP brakes. That's where they
HAVE to be in order to clear the frame at full lock. My front tires are 275/35/18's, and they sit on 9" rims. In fact, I had to add 5mm spacer on top of the added track width in order to keep my tires off of my frame. And my 13" rotors add an additional 3/16" to the track width, even compared to the 73+ LBP rotors. But I knew that when I bought my rims, which is why they're 18x9's with a 35mm offset. If I'd needed the wheels further in, I would have bought rims with more offset. As far as lowering, yes, I may be as low as I can go because of the fender clearance. But, if I roll the fender lips (like I'm planning), the next thing I hit will be the inner fenders. I would guess that will be in less than a 1/2" in ride height from where I am right now, at the absolute most. Honestly, that will probably become an issue at about the same ride height where I start hitting the fenders.
All you have to do is know what your track width change will be for the brakes that you choose, and properly compensate for that with the offset of your wheels. Custom hubs are unnecessary unless you want to run rims that have less offset than what you need for your car.