Anyone know if and how much a Wilwood hub (for ventilated discs) changes the tracking width (compared to say stock discbrakes)?

I'm looking at changing my current homemade discbrake system to a Wilwood system for weight savings mostly.
But since there is nothing useful made as a kit from Wilwood, I'm piecing together a setup that fits my '73 Dart.

I already have a pair of Forged light 4-piston calipers with 1.38" pistons, and a pair of 12.2" rotors:
https://www.wilwood.com/Rotors/RotorProd?itemno=160-0277

This is what I'm looking at:
Hub:
https://www.summitracing.com/int/parts/wil-270-8775

Adapter:
https://www.summitracing.com/int/parts/wil-300-3099/overview/

Still need to find/make the caliper-bracket from the stock '73 Spindle to the Wilwood brake caliper if I proceed with this.

I don't want the wheels to be moved to the outside if possible.
My current discbrake setup is using '73 Chrysler rotors and calipers.
When I installed this system some years ago, I was pleasantly surprised the tracking width had narrowed by about 3/8" per side I recall. This made tire/wheel-fitting a tiny bit easier.