For some reason, I was thinking some of the hi-po 383's got the larger carb in some years. I know not all years, but, I do remember back in the day the older kids saying they got the 440 carb on top of there 383.
I thought the 383 Magnums and Road Runner 383's had the bigger carb. too. Could've swore I read it in a Mopar mag somewhere a few yrs. ago. but mabe like other things, the memory ain't what it used to be.