Stock intake vs performer?

Manifold Comparison

Manifold.........'Stock' 1971 '340' Cast Iron #3512100 .........Edelbrock 'Performer' #2176
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Weight........................ 49.5 lbs. ................................................ 21 lbs.

Port Size..................... 1.08" x 2.17"........................................ .97" x 1.95"
Gasket Size................. 1.16" x 2.27"...................................... 1.05" x 2.07"

Height.......................... 5.00" ................................................. 4.63"

Power Range........... Across the Board .............................. Low-End and Mid-Range