I've designed in quite a bit of electrical dependancy, so the alternator-out running time has me concerned.  With all injectors and coils on seperate switches, it should be possible to extend the range by switching off a set of injectors and the trailing coils, and accepting reduced power.  Does that sound viable?
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I guess you meant "electrical redundancy".

On my 20B install, a 15A fuse blew running 3 LS1 coils.  20A seems to be OK.

Does pulsing two injectors take more current than pulsing one injector twice
as long?

Al