Mark,
This car runs a TH400 I believe, not a Trimatic.
The problem with an interstate purchase, at least in NSW, is that a 350 exceeds the capacity limit of the light vehicle rules.
From memory, 318 cubic inches is the theoretical maximum capacity based on a 1070kg FC sedan.
Hence, 305-307 Chev and 304-308 Holden motors are the legal choice.
However, if you were in Victoria, the car would be a great thing, especially if it presents as well in the flesh as it does in the photos.
You could barely purchase the running gear for it at the price, let alone the bodywork and interior.
I hope it has a hidden brake booster. The original master cylinder looks lonely.