Basically anything pre 92 is a hard WOF, post 92 is where they start stripping stuff out. I had a friend who bought an 86 GA70, and found it was fairly well riddled with rust. Ended up buying a deregistered 91 GA70 shell, swapping everything over and taking it for a revin. I told him to do brakes etc beforehand, and it flew through within a day, easy as.