Another "Is Fuel Injection a Worthwhile Upgrade?" Question

I tuned a 427 Ford with dual quad throttle bodies a few years back. It was a beast. It was for a street car so pump gas compression and a modest cam, but it still hammered out 700 hp at peak. Very impressive setup.
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I do like the idea of an infinite tunability as far as air fuel ratio and timing.. I've been browsing today for a system that is also nitrous capable... I do have all the MSD stuff and I know there's a lot of it I wouldn't need but I don't really want to lose my box or distributor if I don't have to... I imagine I would just be able to lock out the distributor and let the computer take over...