Well you'd best be careful to mark everything you have to take off that's in the way, in terms of wires, hoses, etc. Also you'd better mark the distributor carefully when you take it out. I'd recommend getting your gaskets from GM. You'll also need hi-temp silicone sealer and a torque wrench for the intake manifold bolts. You might want to pick up a Haynes or chilton's manual that gives you a step by step. This job isnt rocket science but it looks to me like it's a bit tedious. At least a 1/2 day affair. I think repair shops charge $500 or so do to this.
So plan ahead, make sure you list all the parts, gaskets, etc. you'll need, use GM gaskets and if you want to put in new distributor parts now's your chance. And be SURE to mark that distributor carefully.
I understand there is a new (pink?) GM coolant that works better than your old orange stuff.