Bolts are drilled out in the manifold and head, thermostat and freeze plugs out and block drained on the 108. Roof rough cut out on the 8-door and the strip above the passenger windshield is fully removed.

I've been searching the net for others and found a dozen so far.
http://vintage-vans.forumotion.com/t25114p15-8-door-67-dodge-van