Mark,
The pink build sheet suggests a two-tone paint job - black on the bottom and white on the top. I'd be interested in hearing if you find any evidence of this. Sounds as though the hood was white.
Also, there should be a tag on one of the bolts that attaches the rear gear set to the center carrier. The tag will have some info regarding the gear set; ratio, build date, etc. Maybe there's something there that further explains what an H code rear end is? Typical Mustang rears used number codes for standard gears and letter codes for limited slips.