It was the initial release of the Grand National and was THE real thing, but more in the form of a pace like car reproduction - all show and no go. It was black and silver, not all black and was badges as a gn. They are the rarest of them all and will cost you the same, if not more than a gnX if you are lucky enough to find one that's in original condition with the 125 HP poop plant. Just do a search on the GN. The info is all over the net.
The turbo regal was the best of the bunch for value. There was a bit of info on a "Special T", A T-Type interior produced with the GN body in 87, but I didn't read much about it... This was the last year for the rear drive platform so I guess they needed to get rid of all the parts and made due when they ran out of GN interiors. This T was probably the 235HP engine though. I don't think McLaren modded engines were used for them.
Z.