Spare tire has the number 70 written on it as does the underbody fiberglass just forward of the carrier. Wheel stamp indicates a Kelsey wheel from the plant designated 1 with a date of May 14, 1990. Wheel designation is XDX.
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I've determined the 70, written on many areas of the car, is a derivative of the 470 written on the clear top. This matches the build sequence in boxes 10 & 24 of the build manifest.
I went to my other low mile ZR-1 and discovered it has 5600 written on the underbody fiberglass. That corresponds to boxes 10 & 24 on that car. (See pic at bottom of this post)
