Headers vs 340 manifolds

Headers is a broad term. Short tube, mid length, long tube, tuned, tri-y. Then you get into pipe diameter and collector size/length.

Remove your stock manifolds, and replace them with long tube headers.Easy 10% increase in power and torque, when your carb is tuned to match the extra flow.The sound alone is worth the swap.
the test above got 9 hp 340s to 1 5/8 full length
the sound is worth it i miss it
9 hp@5500 is not