Jim,
Now if enough people were serious (like 30 - 40) and wanted to do a group buy I could put the time into designing a 4bbl intake ala clifford for the 250/292 series. The design aspect is not what cost the $$$ - a pattern would need to be made to get the intakes cast and then a prototype run done/machined and tested on a vehicle.
Figure $10500-$12000 to get the wrinkles out and 40 manifolds cast/machined. So this is roughly $260 to $300 each which is affordable. The key is to get enough folks to commit $$$. I'd donate the design time to get it done.
Scott it would be REALLY easy to convert the lower intake runners into ITB's

the bore ID is 2.125" a quick trip to the wreckers should turn up some suitable TB's - add a quick flange and done...;)
Yes, I had read your thread. I am only interested in a non-computer / non wiring harness solution for my project. Others though may be ok with the computer, sensors, and harness.
The attraction of this company is the CARB versus computer approach.
Jim G