I was thinking of this dual set-up on my 582.:yes: What can I expect?? What intake should I use?? Cam suggestions?? This custom Wheeler 582 engine will go in a '68 with a Tranzilla 6-speed. Custom Jeff Schwartz chassis/suspension with a Winter 9-inch 3.70 gears
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From a purely EFI standpoint it depends on how the linkage is setup between the two throttle bodies and how much common plenum is underneath them.

EFI is actually pretty flexible with respect to throttling and bores.

You need a spot for a throttle position sensor on the primary throttle. This sensor is particularily important at idle and off-idle.

You need a spot for a manifold pressure sensor or MAP. This needs to be in a common plenum so it provides an overall pressure. Where you can run into problems is with pressure variances as different cylinders go through their operating cycles. The sensor needs to be an area that averages things a bit to provide a smoother signal. Inside an individual cylinder runner for example would be a very bad location.

With the total area of throttle bores on that setup... I hope that it runs a progressive linkage. Otherwise it will be a very touchy throttle for off-idle and cruise because the open rate will be excessive.

If you can find a dual quad manifold that is designed for efi that would be the simplest way to go.
Other than that try to find a 2x4 manifold that has the NOs bosses and use them for your injectors. Setting a carb manifold up for efi means custom fuel rails also. I agree with Steve's recommendation. The key will be in the linkage and the manifold pressure sensor. I see no reason why your engine would not run fine with 2 1000 cfm throttle bodies. I am planning on a 2000 cfm for my 540 cu.in. If you get new identical throttle bodies and make sure the linkage is carbon copy it should be a snap. There is also a way to take two manifold pressure sensors and wiring them to get an average. I've done it plenty of times with hvac equipment but I am drawing a blank right now. It is possible to slow down the action of the sensors by using restrictors and/or a small timing pot. Plan on taking some time to dial it in. I really like the looks of the duo set-up.
I'm sure someone else will chime in with details.
Squido

That's just like my setup on car. Just make sure the tb's are progressive. Works well in many respects.

Thanks for the information. Yes, will be set up with progressive linkage.

fwiw, I didn't even add injector bungs. My oval port intake had enough material I just added the injectors. Unlikely on a sq port. Just welded rail hold downs on it.