Fantastic to see an Aussie flavored discussion on this forum.
I was melbourne based (now sydney), and have owned my E9, since I was 18 yo, (now 51, gulp), it was my first car! (like buying a dinged up, 16 year old 6 series today).
It was extensively mechanically restored by Ian at IDB in Richmond 15 years ago, all while Bill looked on, and offered valuable advice.
Engine is late m30b35, bored / stroked / ported / polished / cammed / high compression custom pistons, headers, mechanical advance distributor, triple matching number original italian webers (all tuned / jetted by powerplay in melbourne), itg custom air filter, oil cooler, brake booster delete (small bore master cylinder), manual steering, with mount reinforced 3.64 lsd, and 5 speed od box.
Bill R is an absolute legend, I know his car well, and it is a cracker.
Enjoy it,
Regards,
Mike