I believe the Autolite distributor in my photo is from a '59 engine - I had two and one is now in the GREENBIRD. I modified it by using the point plate out of a post '76 Duraspark II (Motorcraft) so it could use the Ford electronic trigger. The Duraspark II uses the curved leg vacuum pot - and it all fits right in there as long as you are using a matching point (or stator) plate. The two tapped holes and vacuum pot mounts are in the same relative positions on the Autolite and Motorcraft bodies - and the Motorcraft point and electronic units both accept the same (curved leg) vacuum pots.
When I build the electronic versions, I cut the cam off the Autolite upper rotor shaft and machine it for the reluctor/armature of the later distributor. Once you have the trigger in the case (with mechanical and vacuum advance)- all sorts of ignitions can be used ........ different story.
Steve Metzger Tucson, Arizona