Hello Hans,
I had your same problems and I bought a NOS Carter 3131S on eBay for about Euro 150 2 yrs ago after many unsuccessful attempts to adapt several Edelbrocks. They were good carbs but the need to adjust linkages, air filters etc made it all a bit too tricky for me. I'd try to overhaul your original Carter using the kits that are available from several US specialists.
Cheers
Stefano
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