Nixon being outright impeached would be the end result, but it would be an even uglier episode than in RL since Nixon would be fighting tooth and nail to keep his position, despite the obvious impossibility of it.
I don't see Ford being in a position to give Nixon a pardon, now officially it was presented as a humanitarian gesture, however I think it had more to do with the fact that most of Ford's time prior to the pardon was dominated by the aftermath of Watergate. At some point the circus has to stop in order for him to actually be able to govern the country.
So we'll eventually have Richard Nixon being put on ACTUAL trial for his actions... And having someone with the kind of knowledge that he has on the witness stand is... dangerous. At that point it's a race between the FBI and the CIA to see who can slip him some poison first.
However would the butterflies from this be sufficient for Ford's two would-be assassins, Lynette 'Squeaky' Fromme and Sara Jane Moore to ACTUALLY be able to kill him?
Because if that's the case then we'd have a disgraced and impeached Nixon, his successor Ford being killed like Kennedy in very short order, then I assume Rockerfeller in the White House, I don't think the butterflies are quite big enough for Ford to pick someone else besides Rockerfeller as his VP choice.
The malaise of the 70's will be even more pronounced in any case, the stock market will be even more volatile for a while, and trust and faith in the government would be even lower.