The Aussie Chargers are actually shorter in wheelbase then the A bodies (and wider!) but are about 3" longer in the engine bay.. to make room for the Hemi 6 (like my orange car) Engine wise, the yellow car has a solid cammed 360, very stout.. those headers, and the rest of the 3" exhaust was built by Gonzo, in Qld. and it's an awesome sounding! (and flowing..) setup.
To get big tube primary headers on the Mopars there, you sort of have to go fenderwell, or swap to a rack and pinion usually, as the steering box is in a bad spot for the exhaust.
Oh, and the big polished tank is a coolant surge tank... car also has an aluminum drop tank out back for fuel... guy liked building tanks I think

I will be swapping to a rack set up on my orange car in a few weeks, but mainly for the better road feel since the hemi has nothing mounted near the steering box.
The Torana is an SS, just with the A9X flares and spoilers..