I don’t know about the 50’s as much, but my pa in law has the 40’s on his 350 and they drone like a bugger. I am going to try the Borla XS Pro muffler. I’ve read a lot of reviews and they have compared them to the Flowmaster and guys have said, “This is the sound I was dreaming of...”
nice idle, no droning at cruise, good rumble sound, but when romped on they wake up.

1970 Chevrolet C10
Grandpa's -- My first truck -- In progress to shiny
Follow the build in the Project Journal
1950 Chevrolet 1-Ton Dually
"Ole Red Girl"
In the Stovebolt Gallery
More pictures here
1951 GMC 9430 1 ton dually--Shiny! | 1972 Chevrolet C20- Rusty- the puzzle box lid for the C10 | 1962 AMC Rambler American- my wife's
Parts trucks-
1951 GMC 9300 | 1951-GMC 9430 | 1951- Chevrolet 1300