in NSW you can have mods provided they are period correct and in keeping with the model line up and era. or at least that's what I'm led to believe... so a GX spec Datsun (or replica) would be fine or other period mods..

In the FE FC Holden club if you can provide documented evidence of period mods and accessories then you can put them on if the registrar and club accepts it.

I am still trying to convince them that in the 1950s and 60s; guys were customising, so that should qualify as a period mod... ie frenched lights and chopped roofs etc.

so far.. no.. it doesnt retain authenticity.

Cheers

Ed