I found this video interesting. It's gone the other way putting EFI on an L Series.
https://www.youtube.com/watch?v=aj-Z33MO2Gk
I'd actually wondered how to do this, but after looking at the effort involved in doing this, for a horsepower gain of about 10HP, it seems like a hell of a lot of wasted time and money for such little gain. My 1600 with a worked L20B and dual Webers goes incredibly well, it's a formula I don't think can be improved on measurably on for an L Series - without going down the road of forced induction.
As for an SR20 with dual carbs I'd love to see the cost/effort equation on this, dual carbs sounds so good when the revs climb, perfect sound for a Datsun
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Current Garage:
1971 Datsun 1600
2019 Mazda 6 Touring Wagon
2009 Holden SV6 Sedan