Nice example of the top spec HZ Holden available, and not that expensive compared to a 5.0L Sandman or GTS would be in the same condition.

http://www.ebay.com.au/itm/1978-HOLD...#ht_197wt_1170

In Truganina VIC, $20k.

Has LPG but if it is done right it could be removed without any repairs required (just a few hoels left behind).

Has some nice options: air and steer, buckets, console shift, L31. Not sure if the wire wheels are original but they were optional. Has the dealer fitted screws to the ends of the armrests, twin exhaust might be original too.

Has a few non original things other than the LPG and respray, but none too bad: thermos, air horns, Holley, HQ Deville steering wheel, cutout for CD player (good Prem fascia will be easy to find, and new steering wheels are like $60 on Ebay), aftermarket guage (probably LPG). I doubt you'd buy a good complete roughy 5.0L with good body HZ Premier for mcuh under $8k, and get it to this condition for say an agreed $17k purchase price.