It's actually very simple, you will need the translator and an LS1/LT1 MAF both can be found at any of the turbo buick sites like full throttle. The whole thing is plug and play with the 87 ecm and harness
The LS1 MAF will work with the stock harness. There's no need to change out the harness. The Translator is plug and play, one of the easiest mods I've done.