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Welcome back!
I have a '67 C30 dually that I'm thinking about changing over to coil rear springs with trailing arms. I would install a trailing arm center crossmember and C20 trailing arms with heavy duty coils. I'm not doing it for lowering purposes, just for ride improvement, but it would make it real easy to bag. I can see where the 4 link would be better for a bagged truck and might not be much more work. I don't know if you plan on doing a transmission swap but here is a thread I posted on putting a GM NV4500 5 speed overdrive trans in a dually.
http://67-72chevytrucks.com/vboard/s...d.php?t=673588
Keep us posted on the progress when you start on it....
LockDoc