Big block exhaust is still loud

Not that it's the best solution but 2.5" duals would be far from choking your 383 unless it's 500+ HP.

Going to 2.5" tailpipes and adding resonators there would quiet it down a lot.

Next best would just be adding 3" resonators in the tailpipes.

Triple-pass mufflers are significantly quieter than straight-through though as well. I've run Dynomax Super Turbos and they're too quiet for my tastes unless it's a real big rowdy engine. But then I like loud engines lol, as long as there's no bad drone inside the car.