Depends.Is the 383 the original motor? If it is I would be inclined to stick with that.Be worth it in the long run.
I had a 383 in my 68 Charger and it was strong as hell,even when I ran it with two burnt out valves. Only thing, it wouldn't stop,had drums on all four corners.
However there is something about the numbers 440 that gets the pulse racing on any Mopar man.Almost as much as that word..HEMI.

Cheers KIWI