There have been engines with dual ignition systems; I've seen it mostly on very old fire engines and I think it was common on aircraft engines-maybe still used on piston aircraft engines. These could have both distributor and magneto ignition. So, if you really wanted to...you could get a dual-carb intake manifold and put a carb in one end and a throttle body injection unit in the other. As reliable as "modern" injection units are (and I'm counting anything made back to the 1980's) I would think the carb would be the weaker link as to dependability.
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Bryan
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