After I installed my watercooled engine, I noticed the windnoise was louder at 120 km/h then the engine noise.
The windnoise is coming from the front windscreen.
I read in a aerodynamics book that factory aero mods at the front are mostly meant for noise reduction, and aero mods at the back are drag/lift reduction.
I did some changes, and that lowered the wind noise. It's not totally gone yet, but I think that will be nearly impossible with our 1930's based design.
I will try the extra weather strip, Jason suggested.
These are my mods uptill now:
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Raingutter Fillers / A pillar deflectors
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Vitaloni mirror
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Antenna delete
Another mod that I am planning is adapting blade-type windscreen wipers.