No this isn't an IR manifold at all. An example of an IR manifold would be the Wieand tunnel ram without the top plenum and the carbs mounted directly to it.
The PE manifold in the picture has two plenums, one under each carb and they are attached by common runners.
Here's a pic of the air cleaner it will use. This is from the 64 Ford Fairlane 427 Thunderbolt set up.
The ducting runs off of the side.
This enables you to use a nice overlap cam. In my case 75 degrees.
If I was to use that with an IR manifold like the Webers OR the Weiand with no plenum, the overlap would cause the piston to push pressure back up through the carb and create a negative flow.
That is why you cannot run an air cleaner on a Weber 48ida on an IR MANIFOLD. The air cleaner element would become saturated with not just fuel but atomized fuel and any kind of a spark, even static, would cause one hell of a fire.
Yes the carbs will be two 1850 Holley 600 cfm vacuum secondary carbs and use the Ford 427 throttle linkage that mounts the carbs backwards.
The set up really works very very well and was run on the Mustangs in the Trans-am series in 67, 68 and 69.
This is what the air cleaner looks like. The ducting will run off of the sides to the air scoops.
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