If a blue plate is not fitted may be a issue for qld rego. Maybe a loop hole if you can prove they had a chev? My understanding is now you can't change the amount of cyls? However if the car came with that amount of cyl's they can blue plate them i.e 6cyl falcon/como to 8 is ok as long as v8 was available in that model. Not being sold here as v8 may be a issue. Driving it would be a weapon