im going to be attempting the exact same thing on my 52. Im just waiting for my latch assemblies and door popper kit to be delivered.

some more info, there is a good how to further down the page, but its for the latch in the door.
http://67-72chevytrucks.com/vboard/showthread.php?t=258956

here is the ad with latch in door jab
http://67-72chevytrucks.com/vboard/showthread.php?t=223269&highlight=bear+claw+latch