Not on a Jeep. Did a Solex to Weber on a VW bus some years back. The carb worked great, but the manifold that came in the kit was a mess. We tried everything in the book to make that bus run decent until I found a guy that had done several before and told me the manifold flanges were never flat from the manufacturer. Got those machined and it ran like a champ. Nice thing about the Weber was the interchangeable jets, so you could really tune it to meet your needs and emissions requirements. Don't know if they still come that way.