Hope this helps!

I'm no expert but add my opinion to your list of opinions if it helps.

Remember each GMH plant painted them a different way for example Pagewood firewalls were nothing like Dandenong firewalls and Acacia Ridge were different again.
I dont know which plant if any painted their radiator support panels with warrigal, I bet Elizabeth didnt.

The only way to work it out is to have a good look at original untouched Dandenong built HQ GTS' and see how the firewall and boot compartment and radiator support panels were painted.
Have a look at your own car, are you sure all of those areas were gloss warrigal black and not just a coating of car-yard clear?
I can guarantee you the underbody wasnt gloss black.

It helps to create a paint plan a bit like this one and chop and change it until you're happy.
So this is an example only and you've got some homework to do.

Black full gloss
* Stripes and lower blackouts (maybe not on your 1971 car?)

Black with maybe 20% or 30% matting for 2K
* Front wheel wells upper surface only
* Firewall (probably not, I dont know)
* Radiator support panel (yeah maybe, I dont know)

Satin black
* Front control arms
* Diff and control arms
* Brake booster

Box Black / GMH Black (or just go with the satin black)
* Front chassis
* Radiator support panel (yes for a Kingswood, dont know about your car)
* Gearbox crossmember
* Horns (close enough)
* Battery tray
* Lower steering column
* Peddle assembly
* Bonnet springs
* Steering components

Medium gloss black
* Upper steering column
* Indicator stalk
* Lower dash panel
* Glove box lid
* Door frame blackouts

Low gloss (was basically an etch primer)
* Front wheel wells, under side only (over the deadener?)
* Brake master cylinder
* Grill
* Headlight surrounds (or maybe medium gloss?)

Spray deadener
* Front wheel wells, the rear 1/3 not all of it (under or over paint?)
* Rear wheel wells (under or over paint?)
* Where else?

Smokey grey low gloss black (Sample from boot compartment behind the rear seat)
* Boot compartment (unless you think it was gloss black?)
* Firewall (more than likely)
* Underbody (would look a whole lot better than gloss black)
* Rear wheel wells (over the deadener?)

Zero gloss Suede finish
* Upper dash
* A-pillar covers

And then you can add fan and pulleys, air cleaner, engine brackets, horns, radiator etc somewhere in your paint plan.
Springs may have been left in bar metal, not sure.

Good luck.
Wayne

Chris I had similar issues when it came to painting my HQ Sandman and wanting to try and emulate the factory look, its very hard as even if you have a survivor car to look at its nearly 50 year old acrylic paint to try and determine if it started life as gloss, satin or low sheen as they dull over time. I have heard the stories to where something the firewalls and boot areas were spray with what was largely considered left over paints mixed with black giving a greyish tinge. I used mostly satin black, used the correct suede paint for dash and pillars and the i think from memory 80% gloss for sills blackouts etc. All good advice above and I have no doubt it was slightly different from factory to factory they would have used what they had available just like with bolts etc Good luck