Great thread Oe...
I just brought home a '66 4K series GMC with a pile of options....from air brakes to suspension to HD wiring harness....
I am having probs with pic's right now, but I'll post up a few when I get over my problems..

..
This thing has more ' Factory Graphiti ' than any I've seen so far..ie: "HDWH" ( maybe "Heavy Duty Wiring Harness"...?....duh I guess) on the underside of the hood....a bunch more on the firewall.
Pretty cool.
I really like the paint shop's ID work.
Painters are like Bass Players.
Plenty of self esteem....Maybe even a pain in the a$$.....but ya sure gotta have 'em.
Notice the mid to late eighties painters didn't sign their work....?
Huhh.
I sure do wonder how they new that $hit was gonna fall off so quick.