Wiring problems on a '88 & '87 Coupe Deville

[1987Coupe]

I'm swaping a 4.5 motor from a '88 Coupe Deville and putting it in my '87 Coupe Deville, wich has the HT4100 motor in it. Do I need to take all the wires off the '88 or can I use some wiring from the '87 ? And is there any other things that I'll need to take off the HT4100 motor before I junk it?