[boxhead]

That chassis number looks very much like a number supplied by RTA authorities, most have the state held within the vin(mine are the 7th & 8th characters.
Only kit I remember running the crown chassis (shortened crown) was some early G-Force cars, but the body does not look G-Force to me.
I would be checking more on the vin number you have, as most states do not issue a vin number until the car passes engineering.
And then there is also always the option of club Rego.

But I would first be having it thoroughly inspected by a workshop you know and trust, as driving it may well be taking your life (and other road users) in the hands of the gods.

Good luck with it, and hope it does not cost too much to make safe.