explorer 8.8 in an a-body: experience needed

It works, but well is the questionable area, some people don't even notice the braking is off, might find the fronts doing more work from the retraction and they lock early and not even notice the rear are still just there and doing very little, or the rears locking before the front.
The force is determined at the pedal and its location of the push rod to mount.

What i always do when making cars that were disc/drum convert to disc/disc is i use the 1.125 bore master, the factory masters in the cars were either 15/16 or 1", mostly 15/16.
I always add the 1.125 masters (they are usually from a dakota or truck and are AL and plastic reservoir)
After that i would go for a ride and see whats what, the issue with the retraction of the pistons are a few things, when you hit the brakes they'll move, and when you have a c-clip style axle retention they move and also push the piston back in, you can add the RV to the single line where the split or rear T fitting is to hold both right and left with one
You may find at this point it is all fine, but the braking area of the pad for the explorer would be more than the dart needs and should have a need to hold back some pressure, you have to test it and see what you like.
Make some stops from different speeds and try using the brakes hard and then normally, then i would try it on wet conditions where you may notice either to much front brake or to much rear brake and need to make adjustments