OK, I'm dumb, need help

I agree that they do have their purpose. I just have not reached the point where I see a 6 cylinder engine adequate for what I want.
My 75 Power wagon is a 440 truck. The 67 Dart has a 360. My 70 Charger has a 440/493. My daily driver is a 2007 Ram 1500 5.7L.