(Percentages on map reflect EV.)
With just Adams and Jackson, Clay will be supporting Adams, but a good deal of Crawford's popular support will flow to Jackson, but I think his Virginia backers such as Jefferson will support Adams instead. I think Adams would have won, but Ohio and Virginia would have been close and either State going to Jackson would have swung the election to him.
145 Adams08 Connecticut
02 Delaware
01 Illinois
14 Kentucky
02 Louisiana
09 Maine
03 Maryland
15 Massachusetts
08 New Hampshire
32 New York
16 Ohio
04 Rhode Island
07 Vermont
24 Virginia
116 Jackson05 Alabama
01 Delaware
09 Georgia
02 Illinois
05 Indiana
03 Louisiana
08 Maryland
03 Mississippi
03 Missouri
08 New Jersey
04 New York
15 North Carolina
28 Pennsylvania
11 South Carolina
11 Tennessee