I would go with the sidedraught carbie for sure if you are chasing performance. DCOE webers and Delortos, Solex, for that matter are very versiltile carbs and can be setup to suit almost any application.
The stand out difference between the DCOE sidedraught weber and the DGV downdraught, is that the DCOE has syncronous butterflies (both throats open at the same time) whereas the DGV has a primary and secondary (cant remember if DGV has machanical or vacuum secondaries).
If you are wanting a daily driver that is easy to drive, i would go with the DGV weber. Im not saying DCOE's cant be used for a daily driver, they just can be a bit trickier to setup, tune and expensive to buy jets / venturies / emulsion tubes. On the otherhand, there is nothing quite like driving a car with an engine with a pair of sidedraught webers. You have to experience it to know what i mean.
Just to confuse the issue, you cant forget the IDA and IDF downdraught Webers (i think there are a few other models as well). These carbs have are very similar to the DCOE sidedraught in their functionality, but stand upright like a downdraught.
At the end of the day i would give the sidedraught a go. If you have all the bits (manifold, linkages etc). Your car may run better than ever. If you are chasing indepth info on weber tuning and performance, buy or borrow a book on weber carbs. They can explain better than i ever could..
Hope this helps
Cheers
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