Rear end... Disc or Drum?

[FINE'49]

With the body work done and in primer, I've started accumulating drivetrain and suspension components. I will be using a weld in Mustang II type front end with dropped spindles/disc brakes/rack. Now, shopping for a rear end. My local "pick your part" has a good selection of S10's, Blazers, Bravada's. A couple have disc brake rear ends. I know a lot of guys use entire S10 frames under their trucks, so I'm guessing the axle width will work great, mated to my original frame. I'm curious which the majority of you would choose, the drum or disc axle? (Cost is the same for either)
Also..... I'll be using a 350/700R4, any issues with the durability of these rear ends behind this combo? I'm planning on bagging the truck and think I will remove all leaves except the main one, letting the truck drop as low as I can. Anyone done this, or is there a reason why it shouldn't be done?
Thanks for all suggestions!