I do.
I have been asking everyone who has an 86 for their last six numbers so I can see if she is the first of her kind. So far the closest is 003750. Sadly the door sticker is faded and I can't see the build date. But, everything I have taken off has had a tag or sticker that says 4/85.
That is the reason I went away from the 4 door conversion on this truck. Also why I am making everything for the Magnum swap a bolt in affair. Once I saw the VIN I thought she might be an extremely early truck. The options in it were weird too. 2.5, 4X4, AX-5, A/C, no power steering, black on black, and chrome bumpers. All on a base truck?