Not to come off as being smart, but the most useful tool you can use right now is a tape measure. You have everything else, the tape measure will be the most definitive tool in making your decision now...
You already have the willingness to undertake the project, so start with a tape measure and sort everthing out to see what you may or may not need to make it work.
Stock 1978 F250 Custom regular cab 4x4 with 351M and 4 spd.
1991 Bronco silver anniversary, 5.8L EFI, E4OD swapped for C-6, custom trimmed rear fenders finished in rust.
2007 F150 Lariet super cab with SnugTop bed cap and 5.4L V-8