Smallblock 2x4 setups

Whats your theory on this Rumble?

I have noriced that cfm formulas are not on line with what the car will do at the track.

Hmmm....TQ's are rated at 850 cfm. x2 would be 1700 cfm. Little overkill for a small block don't you think?

Engine set up dependent. I have seen old pictures of small block set up like this for compotion useage.

I would imagine that once the secondarys opened the venturi velocity would drop like a rock, which would as result in a severe lean condition.

No, because you would tune the carb for such use. YES, velocity would drop, but then again on a race intake and numericaly really high gears, it will not matter much.
You can also tune when the door opens and how much it opens alittle bit.
The smaller T-Q's are said rated @ 800. The primarys are smaller.

388dart, redrill the Magnum heads for "LA" intake useage and port the hell out of them.

Captin; I'd love to do a couple of these on a low-pro manifold, but haven't found one that would fit 2 TQ's yet.

And you probably won't. BUT! Welcome to the world of hot rodding. Now your into custom work. I think it is Offenhauser or Mr. Gasket make off set adapters of such use with Holley carbs. It isn't really the carbs pad thats a challange, it's fitting the 2 T-Q's next to each other. If it requires a small off set, thats where the work comes in.
Start with a couple of basic spreadbore to square bore adapters and start cutting and modifiing them to fit. Once you get it to fit, go to a peice of aluminum stock and cut out the shape from the template you made out of carb board and cut up adapters.