How would African-Americans vote if these were the candidates for each party?

[Vice President Christian Man]

This would never happen in today's political climate but in this hypothetical situation I'd say Dems would still get somewhere around 60% of the Black vote. People tend to underestimate the number of people who'd support someone with a "D" or "R" next to their name despite their ideology.  For example in 1978, Edward King who was a Conservative  Dem won over many strongly Dem areas in the Massachusetts despite clearly being to the right of his Republican opponent and many post-CRA segregationists did well with the black vote when they ran for re-election.