4-lug front suspension questions and identification, Please help me identify or verify the parts I have and the ones I need Options

[Boomingbeetle]

Hello all, thanks in advance for your knowledge-

I've spent a few hours with the search function and only have more questions. I began working on the front end of my 71 -4, starting with 320i ATE caliper conversion to help stop my 2430 monster. I intend to add front swaybar, replace the shocks, control arm and strut bushings and probably turbo tie-rods as well - but came upon a problem after fitting up the calipers. I have the sneaking suspicion that my car has later spindles.

See the pics below, the caliper is offset to the inside and almost rubs on my rotor at the outboard side. My understanding is that the 320i caliper will bolt up to the early spindle and be offset toward the outside. Also, my rotor is about .02" under min spec, so I need new ones... the caliper might not fit at all with thicker rotors. Here are my questions if you can help to figure out before I start ordering any more parts:

1. How can you tell the difference between an early and late spindle/strut tower?
2. Can you tell the difference by the rotor? Since I need to get new rotors and bearings, they will have to match whatever spindle I have or purchase to replace. same with the ball joints and bushings I imagine.

3. I'm not opposed to buying raised spindles to install, would these be compatible with the calipers without machining them? Or I can try to order a complete set of early suspension to rebuild and install. I like the way my car sits now with 15" rims, and my control arms have the u-channel for sway bar drop links. I do not want to do any welding for a bump-stop bracket.