Sunny gearbox myth

Was speaking to a Micra hot rod builder this evening and he reckons if I install 1st 2nd 3rd from a 1.5 sunny that it would be a lot quicker? Gearbox would be cg10 , opinions please..
 
quicker acceleration or top speed? i would think the sunny has longer gear ratios all through the box. putting 4th and 5th from the sunny might be an idea though
 
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