Gday and welcome,
Although being familiar with the torana stuff - I think there are better set ups out there IMO. Make sure you look at a lot of cars before you make your final choice. The homebush has a really great shape - make sure you compare profiles before you settle on a drb.
If I was building again I still dont know what I would choose, but it would be between harrison, classic revival - or maybe custom chassis and homebush body. Before the arse fell out of the dollar importing would have been a great option.
Good luck with whatever you decide.
Cheers