Tuning Shorter Gear Ratio

[Miguel16v]

Hi,

I have a Fiat Coupe 1.8 16v and using it for trackdays.
I would like some shorter gears.
Does anyone have any suggestions?
I was thinking about a gearbox from a punto 1.6 or an Alfa 145/146 1.6?

Thanks in advance.

Greetings,
Miguel