Weiand 7507 Intake Manifold 340

That dual plane is a Stealth. An excelent intake.

A Stealth is # 8022.
I'm pretty sure that particular intake is the predecessor to the newer Stealth. The Stealth has a little bulge cast into and beneath the carb pad to where you can modify it for a spread bore. That one is cast for square bore only. You may also notice the intake ports at the head slightly off from each other. But, yes, both are good intakes.