1.6 gearbox has shorter ratios than the 1.8 gearbox. Other differences are cams, I believe the 1.6 cams are less peaky, to help make up for the lack of 200cc low in the rev range. Also, the 1.6 doesn't have the variable length inlet manifold.
As the engine management will remain 1.8 (unless you swap the ECU, key chip & codebox), I would suggest leaving the 1.8 inlet manifold on and perhaps it is also worth thinking about leaving in the 1.8 cams and timing it up as a 1.8. But it may leave the engine feeling very lacking in low revs, especially if you stick with the longer legged 1.8 gearbox.
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