If memory serves me, in 88 there was no computer on the P30 chassis. The carburetor was a Rochester Quadrajet and the ignition was electronic module with the coil in the cap and vacuum advance. The transmission would have been the Turbo 400. I had an 88 Southwind on the P30 chassis so I am not just guessing here.
03 Silverado cclb 3500 drw, D/A, Reese 22k hitch
07 Alfa SeeYa Gold 30RL,2 slides,power everything