We once had a '72 C20 w/ the "Longhorn" option -- that longer-than-8' fleetside bed, wooden to boot -- and 400BB / TH400, 2-piece rims, two-tone paint and quite a bit of chrome, the toolbox on the passenger's side of the box like yours, and dual fuel tanks.
I wish I had a picture.
A few years back at the Syracuse Nationals there was a beautifully restored C20 Longhorn -- I think it was also a '72.
If I can find the photos I took I'll be sure to post up a couple.
In the meantime, I found a nice example of a 2-tone Longhorn at the Bring a Trailer website. Sold last year for a cool $29K.
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Bring a Trailer 2 tone big block Longhorn) Note: There's 96 photos of this fine ride, well worth a peek.
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For what it's worth, it's a rare sighting, but whenever I see a factory tach in this dash I take the time to drink it in. So nice:
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I really enjoy the '68-'72 trucks. Like the GMT400, nice lines, form follows function, have no problem at all being seen behind the wheel of one of these machines. :0)
OP, enjoy that '71. From my perspective you are living the dream.