In my opinion I would boost the d-series. Everyone rags on them, "oh they're only SOHC blah blah blah". But a d16 is like a fat chick, everyone knocks ya for it but just wait till they see what she'll do for ya. But if you want to swap then I would recommend building an ls/vtec. Itll give you the combination of more hp plus the torque from the ls. Also price-wise itll probably be the most bang for your buck
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