Panic,
Your 1st paragraph is what I've seen. With a V8, long thin runners vs short fat runners...we know what it does and it's been tested, documented, compared and contrasted. The vendors publish a lot of info on their websites.
Clifford's only claim with their single carb manifold is to 'hold on to the steering wheel'. Not a lot of empirical data there...and if you install their intake/exhaust kit it will 'increase power and torque 70%". 70% over what? It doesn't state 70% over stock or even which engine.
