Aside from jetting and emulsion tube concerns...... Take a look at your manifolding and how the Weber side draught adapter plate interfaces with it.
And your throttle linkage. Most of these dual DCOE adaptations to plenum style intakes are configured so as to use a progressive throttle linkage. To do otherwise would be much the same as opening all 4 throttle bores on a 4bbl down draught carb simultaneously.
Of course, with your DCOE carbs positioned to either side rather than one to the front and the other to the rear...... With a V-8 engine, that places both primary carb throttle bore openings on one bank and both secondary throttle bore openings on the other bank. The usual 'fix' for this is either to use an open plenum style intake or if using an intake having a center divider in the plenum...... To remove (lower) the center divider by at least an inch.
To further complicate matters, the Weber side draught adapters I have seen have no internal center divider. So when the progressive throttle linkage opens sufficiently for throttle bores of both carbs to open, you not only have an abrupt 90 degree change of direction in flow from horizontal to vertical at the adapter plate / manifold interface...... You have a train wreck where the two opposing directions of flow (from left and right) converge as they enter the plenum.
An interesting solution might be to modify your DCOE carbs so that each has a primary throttle bore and a secondary throttle bore which opens progressively. That way, both DCOE carbs will function much like a split 4bbl carburettor when mounted on your adapter.
This is a modification that is done by Corvair Performance Parts for their single DCOE draw through turbo setups......
http://www.american-pi.com/corvair/html ... etail.html
http://www.american-pi.com/corvair/corvhome.htm
And as Corvair engines are a bit over 1/2 the displacement of your 5 litre V-8...... A pair of DCOE carbs configured in this way should give you the drivability you seek once you fine tune them to your engine. This should work well on either a dual plane or single plane open plenum intake. If using a dual plane intake though, you might consider leaving the manifold center divider in place and adding a center divider to your Weber DCOE adapter. You will still have the abrupt 90 degree change of direction from horizontal to vertical where flow enters the plenum...... But you will eliminate the train wreck where without a center divider, flow from the left and right bank throttle bores merged previously.
Just an idea,
Harry
