71 Dart 410 stroker ..

Top end makes the power, displacement decides where that power is made (powerband) and gearing matches the car abilities to the engines powerband.

To me the rise of 408's is due to most don't want to run more gear than 3.55.

Eg. Say 450 hp 360 and 408
408 500 lbs-ft x 3.55 = 1775 lbs-ft
360 433 lbs-ft x 4.10 = 1775 lbs-ft
360 433 lbs-ft x 3.55 = 1537 lbs-ft