Stop in for a cup of coffee

Ok give me your opinion.
Took my buddy for a ride in the Barracuda last week. Just around the block a couple times working listening to the timing.
He felt the car had a bit of a growl and thought a bearing was bad.
Last year my buddy the wrench thought the same thing.
Had my MOPAR buddy, smart like you guys, built and torn apart these cars build them ground up type guy.
He went for a ride and said its just a big block MOPAR.
Does have a growl, does go away when you push in the clutch.
It drives fine, turns fine, shifts fine, no uneven tire wear.
Any concerns??
That's the four speed gears you all are hearing, my 340 four speed sounded the same way