Electronic ignition upgrade

I have a buddy with a 383 in a '63 Dodge 440 and he'd like to add electronic ignition. What "parts store" distributor would he shop for? I took a quick look at RockAuto and did not see a 383 listed. Would a distributor for a 440 work for him? I'm OK with the ECU & wiring. What do you think/advise?
440 dizzy will not work in a 383 as a 440 is a rb block. A 400 dizzy will fit a 383. Mike