Not knowing what you've done to the engine, I would say a progressive 2 BBL. like a Weber DGV series or the Holley 5200. I believe Stovebolt has adapters to a stock intake for the Holley and theWeber is not much different. I run a Weber on my 235 and love it. Idles great , good mileage and performance. Good luck.....
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Inliner 4119 and proud of it