One issue with the 2cv is the height of air filter, alternator and oil filler/breather unit. I had to reposition the location of the altenator which wash't a simple operation but came out good.
I wanted to avoid the bubble in the bonnet like this one has..
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and welded a bracket to the engine support
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On the last pic you can see the original place of altenator and oil filler.. Hob bout that HUGE air filter.....