I think what I might do is have an AL and NL African American AllStar team from 1979 time travel to 1949 and take the place of the worst team from that year in each league. Premise being that a useless team was replaced by this team from the future.  Would then see how this team fares against the teams of that year.    Biggest problem will be filling out the rosters for the Time Travel teams.  Did a quick study today and 1979 wasn't high on African American pitchers, catchers or third basemen.  Lots of great outfielders and 1st basemen but slim pickings at most other positions.