I have Magnaflows similar to these on my '51 (LS1) and it sounds pretty good.
https://www.magnaflow.com/products/1...rmance-muffler
When I had the exhaust made, they recommended two things.
1: Keep the mufflers close to the headers. They said this would reduce the drone because the further you let the exhaust travel before passing through a muffler the more drone you will have. Due to the sound waves bouncing around in the pipes.
2: Run the pipes all the way to the back. This way, even if it's a little loud it will be further away from you.
Adding a resonator before the muffler may be a good fix for this problem.