Help Identify Early 318 Single Plane Intake

My 71 dart w/318 had one.
Nothing special and yes they went single plane/open plenum and they would keep up with any run of the mill 350 from the same yrs and later. My 74 dart also had one, it kept up with my buddies 69 Malibu 350.

They're no race part, if they were used for racing ...great...but calling them a race part is like calling the edelbrock performer a TransAm intake.
All the runners are the same ugly not quite a rectangle little caverns. They weigh a ton, and putting a 4 barrel on it is funny because he mounting flange isn't as big as the 4 barrels put together...so it's like a restricter plate on the street...no jet change is accurate due to that.
The performance snap comes from the smaller primaries of the 4 barrel. Ultimately it flows the same peak flow.
You could put a 4 barrel manifold on and not change the cam and it would make more power and run just fine due to the same thing the current benefits from....smaller higher velocity venturis/ primaries.