AJ's Opinion; what size SBM do I need

I'm not buying that the 383 is to the Big Blocks what the 318 is to the small blocks.
Back in the fifties or sixties you could get a 383 with two four barrels on it. And I have yet to see a roadrunner with a two barrel from the factory. I know you could get a 383 2 Barrel in the charger but I believe you can get a 318 in a charger also. I'm talking early 70s late sixties.
383 is no dog or boat anchor.
I would say the 350 big block or the 361 would be comprable to the 318 in status.