Craig,
Im sorry for this, and i hope i'm wrong but things have changed. Even if the cage was homologated back in the 80's it is not legal now. Safety regs supperced all previous regs. The front roll bar leg can only have one bend in it, it can have an another staight leg from the top corner down to the floor or have welded brackets to the windscreen piller ect. but as far as i understand nothing else. Please check this out , MSA will tell u if ok but dont get too far without checking.
As i say im not the oracle on this, only trying to help
John