New trucks don't sound like old cars - why?

It might be the Magnum motor. I'm trying to find clear sound clips fro comparison, but here's an interesting one: a 5.9 Magnum in a Valiant. To me this sounds like a modern truck.

Plymouth Valiant 5.9L Magnum V8 Acceleration 0-60 SOUND - YouTube

Still trying to find an equivalent clip for an original LA without another car in the opposite lane.