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I'm not saying the DAGV is junk -- I ran a DGV for years in a mild performance motor and liked it. It will give you good power through the midrange, but not at higher rpm. It's probably OK for short autocross circuits where speeds don't get much above 40 mph.
It definitely will run better than worn-out SUs, but not ones that are in good shape and correctly tuned. SUs with wear around the throttle shafts cannot be tuned (although people will fiddle with them daily for years before realizing that). Once put into good shape and tuned with the right needles for the application (KD or possibly DX needles for your motor, would be my guess), they don't need much attention at all.
For best combustion efficiency, you want the intake charge to go past the intake valve at maximum velocity. Turbulence in the airflow is the enemy. The more bends the air has to negotiate, the more turbulence you'll have. For an inline motor, therefore, side-draft carbs always have the potential to flow better than downdraft carbs.
Weber side-drafts (or similar) will potentially give more power than SUs, but they are expensive and a #### to get set up right. They really want to have serious air horns on them, which means taking a great hunk out of the inner fender to make them fit. They *can* be tuned for excellent fuel economy, common wisdom to the contrary.
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