The way I see it piecing your own EFI system together allows you to spec your system out to your needs, lets you pick the ECU you want to run (or have prior experience tuning), and going distributor-less let's you run sequential ignition timing for much better ignition control - this isn't needed but let's you get the tune dialled in far better than adapting to a dizzy.
The car would still run with a bolt on system, but in my experience those bolt on kits are only 80% sorted and generally benefit with a lot more custom tuning to suit the specific motor. If you have a high compression engine or want to run flex fuel or do other things like that, then setting up a proper standalone ECU and piecing your control package together yourself is the way to go, IMO.
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