Your car would have originally been equipped with an Autolite IGS4211 distributor. In 1949, KF switched to an IGS4214, which can be used on your car. It has slightly different specs but for interchange, it will work.
You could also use a Delco 1110224 distributor, but it's not a good idea to mix Delco and Autolite components.
An Autolite IGS4205 will also work...it's actually a 1940s Nash application.
There is no modern substitute given how it mounts.