Hi Tom
You can buy a S4 or S3 single downdraft manifold (they were used on most of the S3+S4 Alpines) from eBay occasionally or post a wanted ad on this forum and see what happens. Someone may also have the correct Weber that you need as well or just buy it new from SS. I understand the jetting may need to be changed some as well as the linkage. Do an internet search for single Weber on a Sunbeam Alpine as I think there is a tech tip out there somewhere. I had an Alpine with the single Weber and it really ran good. You will be happy with the conversion. Eric
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