Coil: The coil is a bit of a PITA to replace. It's mounted to the intake manifold towards the back passenger side of the engine. The catch is that it's RIVETED to the bracket that mounts it to the manifold. Unbolt it, drill the rivets out, and mount the new coil with the supplied bolts. WTF GM?? Riveting a coil to the bracket?!?

Mushy brakes: I have read, but not tried yet, that the GMT800 brake master cylinder is a direct bolt on to the GMT400 and fixes this problem. I'll see if i can track down the thread over on where I read this.

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Here we go: How to: NBS master cylinder swap for firm brake pedal

They go off on a hydroboost tangent, but the info is in there for a straight vacuum boost setup.