I'll sort of answer this in kind of the opposite way this was asked, as it sort of makes the most sense (for myself) in terms of answering it.
The first question in this, principally relating to that of the domestic aspect is how exactly does he attain victory and what does it look like downballot? I'll presume for this that it would be continue as a Democratic majority in both the House and Senate.
In regards to the domestic situation, I'd imagine Ford would be quite limited in terms of what can be done considering a Democratic majority in Congress, and so will be facing problems like he has before (and likely to be worse following the midterms). Principally, I'd imagine his major and noted legislative achievements would likely be in the form of deregulation in that of transportation industries, natural gas, and oil to say the least. There could be some additional aspects on that in terms of telecommunications, and so on, but it'd be more of a question there in terms of the legislative aspect in how much he can achieve on that side, but also from that within the executive as well. There's also the matter of the Courts, and I'd expect he'd likely replace Potter Stewart on the Supreme Court.
In terms of Cambodia, that is a more difficult question to answer and for how the US responds I'd argue depends on who is Secretary of State, who is Secretary of Defense, and arguably who is that of Director of Central Intelligence. Is it still Kissinger, Rumsfeld and Bush, or is it someone different in those positions? How that gets solved would depend on who is in those positions really.
In regards to the Panama Canal, I'd expect what happens there to be similar if not the same as for what happened to Carter with an eventual return of the Canal to Panama. Ford had campaigned on that in the primaries, and was one of the biggest 'issues' Reagan used to attack Ford in the '76 primary and I believe was a factor in term of Reagan's victory in North Carolina.
Afghanistan is again probably the same as Carter, but there could be some differences in part because of what happens in Iran and if there are any changes in terms of whom the Soviet premier is...
Iran however, that by far is the biggest question and challenge to this all. The biggest issue by far in terms of how Iran gets solved is by that point of when it happens, you are nearly three/four years into that of his second term, so you could have by that point several decisions in play in terms of influencing that of the events that happen. There would likely be a bigger presence of Americans in that of Iran in terms of supplying military hardware and training and so on, and also that of the Shah wouldn't be faced with the concerns of being cut off from military hardware sales by 'human rights' policies, but I'm not sure I could answer this in a clear way by the point in time. I feel
@Yes however would be likely to answer this better than I on such a matter.
