The reason FRPP specs '87-'93 is because of the front rotors. The spindles used on the '87 and up cars are larger than on the '79-'86 and '87-'93 4cyls.
The rear componets will work with both a 7.5 and an 8.8, but the front spindles will have to be changed to '87- up V8 parts before you can use the kit.