On the subject of timing at start up, the Pantera-Electronics Ignition Controller retards the initial advance at start I think 10 or 14 degrees. It does make starting a hot engine very easy. It has none of the reliability problems of the MSD units.
The Ford Motorcraft units do also but don't have as many features.
A Mustang with a 351c uses the same starter as well as a 289, 302, 351w. There are two versions though. One is for a manual trans and the other is for an automatic transmission.