I had my KE30 with an SR20DET signed off with 6 ADR's back in 2006, and although had a few queries, mods were done at the time, did not require updating,
I am currently building a Mk1 Cortina with the same engine, and have 7 ADR's signed off prior to the 1 Nov 2012 cut off, where the new NCOP has been adopted by QLD on the 1 Apr 13, which outlaws welded roll cages, and no bends in the rear bars, and restrictions on certain types of engines in cars, eg. Turbo V8's are no longer allowed in VL commodores,
CA in the KE seems to be ok, but you need to find an engineer to sign it off, and given the recent changes, be prepared to not only pay to top dollar, but also rejection
Prolly best to find one already done and for sale