I just replaced an aged Rochester on my stock 235 with one of Tom Langdon's Holley/Weber progressive 2 bbls. He suggested the H/Weber 5200 (270cfm)($65) setup over the Carter/Weber ($85) that flows a little less and works better on a 2-1 intake. There is a bunch of info available on tuning and rejetting if you feel the need. I personally am looking for 20 mpg@65mph.
I was totally amazed at what a simple, inexpensive upgrade this actually was. I had tried the rebuilt route and couldn't find a rebuilt that had a decent throttle shaft and that was assembled properly. The H/W was $65.(with no core charge) the adaptor was $15. and the linkage was $35.00. The water-heated choke to 12v electric choke conversion was $12.00. He also sells a little paper filter breather for $35-45 bucks.
For less than the cost of a worn-out rebuilt I have a setup that runs as smooth as silk and for the first time I feel like my little 235 is responsive and operating efficiently. I've got some pics in my album that show the linkage and carb. This single progressive 2 bbl. will fill the bill until I recam and try out the C/W dual setup. At this moment I really feel that it can't get much simpler or less expensive than this upgrade.
