[surfsama]

Originally Posted by Tom Vaught

Agree, RPM manifold is designed for a Holley carb.
Nos plate probably designed for a Holley carb and RPM intake.

He is trying to run a Q-JET Carb with a Q-JET NOS Plate on a square bore manifold.

The center divider will not be the issue, the issue will be the edges of the intake opening.

Tom V.

I could be misreading the OPs post but if he's talking about an Edelbrock Performer RPM manifold it has a spreadbore configuration (at least for the Pontiac engine).