Yeah man....don't over think this. The spindles will work with a bump steer kit. I used UPR for mine....they lasted a few years daily driven in the city and sitting for a few more. They're actually on the turbo car I'm building now. I used white lithium grease to lube the outer end. ( heims joint ). No play and no rust. And I don't have a garage.
The rack bushings allow more adjustment for bump steer but I drove a year or so without them. Still drove better than when 4 lug.
Its not a big deal....get the spindles. For the brakes, a lot of people use an adjustable proportion valve and a sn95 master cylinder. The rear brake line will not bolt up to yours. If you get the adapter and length of line behind it.( on the body) after the rubber hose you can flare that line and yours and use a coupler.