Snake,
Your link doesn't work.
Plus, my Jag brake-equipped Cobra has excellent front-to-rear brake balance, as did my 1965 3.8S which had a very similar braking system.
Here's a reference which explains the front-to-rear brake balance as set up either by the factory, or by you if you use an aftermarket proportioning valve as I do in place of the factory unit. Look on Wilwood's site or Baer's site or similar to see some of what's available.
Link:
https://auto.howstuffworks.com/auto-...ter-brake2.htm
Hope this helps,
Tom