Questions about club reg in vic

Hey guys,
 
Im looking at changing my escort to club reg.  Im a member of RSOC.
 
vic roads said it can be changed with a letter from a club scrutineer.  What kind of things would not be okay? i have fiberglass flares , ebay front falcon brakes, modified mk2 escort coilovers, falcon seats, battery in boot.
 
Also anyone know if you can keep custom plates?
 
Thanks!!!