1984:
Reagan: 525
Mondale: 13
Mondale does marginally better, but not enough to improve his electoral map, still leaving Reagan as the most successful presidential candidate EV wise since FDR. For VP meanwhile...
Bush 535
Ferraro: 3
Yep, it's a 50-state landslide. Thank God for the 23rd Amendment or we'd actually have ended up with the first unanimous Electoral College since 1820 (faithless electors aside). Depressing to see the first female VP nominee end up like that, and the cultural implications would almost certainly be even bleaker than IRL.
I think that Mondale wpuld have won Massachusetts in this case.