err... alternator has nothing to do with EFI.. unless it is too small to power things.
it will be fine
dizzy.. that depends if you want to have ignition advance or not. the 4AG one will have no advance at all.
at worst, you could just swap the guts of a carby dizzy into the 4AG one..
tho it has to be asked why you want less power and drivability for a track car???
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