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I have been going through this with my '64 Bonneville. I have my original 389 out to 400ci, with Edelbrock heads, and was developing a 2x4 dual quad EFI set-up using a standalone ECU.
This swap couldn't be much easier right now, though common cars like Impalas and GTOs benefit from more aftermarket parts making it a bit easier. Personally I avoid the "bolt on" EFI "kits" as throttle body injection is really not proper injection - you need port injection to get the best from EFI.