Skaterking

I have a project planned. I will be gutting the interior. I have a 1988 N/A vert. The wiring under the dash is all screwed up. I was wondering if I gut everything out. Just the shell remaining. Will I be able to use a T2 s5 long block with out having to change the front cover and intake manifold. I will be using s5 ecu, s5 wiring harness, s5 dash and wiring. I understand this has been asked way to many times, but I am hoping to get specific and clear answers to what I am biulding and I hope I gave as much information as I can.