The sound is more so due to the narrow (numerically low) LSA.
The extra duration as said extends the lower band.
The thumper cam seems to work very well. I have one in my sons truck 360 engine now. It’s 10.5-1 w/RPM heads, 1-5/8 headers, chink air gap, 600 carb. Works well. Has a good upper rpm power.
Engine spins and pulls up until approximately 6500.
It has an intake duration @050 of 230*’s.
If it can actually use this extra duration, IDK for sure. How much is needed for a daily driver or mini hot rodded car, IDK