While Ford instead of Carter as president probably would've made little difference for 1977-1981, the ripple effect through today (no Reagan revolution, etc) is hard to apprehend.
One of the most important "butterfly effect" elections I can think of, even if the presidential term in question wasn't all that consequential,
I agree that both parties would be very different today if Gerald Ford win in 1976. The Republicans would probably remain similar to how they were during the Eisenhower era on policies, whereas the Democrats likely would take the Christian Democratic route (especially if Jimmy Carter runs again and wins in 1980). The Democratic Party’s main base of support would probably be the South, Appalachia, and the Rust Belt, whereas the Republicans would remain strong in upper New England, states with high suburban populations, and in the Western states.