You missed the point. Real jag mechanics are RARE... Jag does not publish or release data or maintenance info including drawings or repair manual AT ALL. Seriously. Lots of people claim, but they screw up more than they repair if it is beyond basic maintenance and the parts are brutally expensive if even available. Can buy a Haynes or Chilton for any car EXCEPT Jaguar.
I’ve done plenty of work on later model v8’s including a couple dozen timing chain jobs but in reality Jaguar went away with the end of the series 3 sedans. Bringing a 73 E back right now that was stored since ‘88. Will be for sale.