Don't think so - I had a friend with a 1969 AMX that had a dealer installed Edelbrock Crossram STR-11 intake manifold as option (rumored to have been the same setup as on the SS AMX) with a pair of 660CFM Holley #4224 carbs. Looked similar to the Z-28 cross ram and that car would definitely fly!

That looks to be a custom piece set up for monster Dominators - maybe a on a 390 AMC? It could have been run by a "factory team" as there were a lot of skunk works type engineering going on in the late 60's. I know Ford experimented with some exotic manifolds but somewhere along the line SCCA outlawed them.

Interesting piece and appears to be well made. It would be fun to see and hear in action but your brother-in-law would have to be an oil sheik to be able to afford the gas that bad boy would drink!