Hi,
You have a hydraulic cam so the RPM range will be limited to about 6,000 rpm. That means your 8,500 RPM manifold is mismatched to your cam, get the Edelbrock RPM manifold. Yes it makes a difference you can feel and measure at the track. You have a street car, not a drag car so you launch at a much lower RPM. You can expect a 2 to 4 tenths quicker ET with the dual plane manifold for you application, and much better throttle response.
Perry.
