Mostly valid argument. I can build a 500hp 400cu in Chevy for a LOT less money than a 500hp 283, and make 100ft lbs more torque and run less rpm, less gear, and probably be faster.
The same situation exists in the Mopar world. Is there a good reason, (other than maybe a stock eliminator car) to build a 273 to 500hp (or any other number) instead of a 360/408?