Looks like I haven't poked my head in on this thread for some time.
Thanks for all the suggestions, guys.
Browsing the forums this eve, I just saw this member's truck and thought; hey! could that be mine?
He lives in Tigard, Oregon - just west of Portland.
http://67-72chevytrucks.com/vboard/member.php?u=27835
Then I noticed it's a 66, and even though he had the same idea of using fleetside tail-lights on his stepside, his look to be mounted a little lower than mine.
Of course I think mine were mounted at the perfect height.