Here is some more Big GMC's:
http://67-72chevytrucks.com/vboard/s...=313752&page=2
Scroll to Post #30
I'm not good with pictures if someone wants to re-post them on here.
Notice that the Red GMC Dump has a Toro-Flow Engine. It is also a '66 Model.
The first GMC is either a 5000 or 6500 Series depending on what engine it has (a 478 V-6 would make it a 6500).
Bill