Welcome to my nightmare T-bar!
I love '70 Cuda's. Too bad it is not a bad ass Hemi like my '70 Challenger but you will get there. Very nice car.
The seat belt issue is crap. My Challenger only has aftermarket lap belts only, i also hate the seatbelts cutting my neck so i never fitted them. I have bribed my local blue slip guy whom had no idea what to do with my car and rego was a breeze. There is no ADR's to worry about in NSW for a '70 make US car. Anyone tell you that you need an engineers report for a US car built before '72 in NSW has no idea what the rules are. Queensland rules are the most ridicoules. Good luck guys.