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I'm in the middle of changing over to a Weber from my weak Solex installation. I have to trim the intake manifold on the fwd bolt hole location,(which is simple enough)an 1/8th ". The Weber kit did not provide a rod end ball joint female 10/32 thread to screw on the throttle cable. There were some excellent photos someone on this site posted but, I'm unable to find them. I printed one but need the rest of them. It's worth the money because every year I had to tweak the Solex carbs,
Chances are the Webber carb that comes with the "conversion" isn't marine legal...I'd check that before shelling out for it.