Wiring
So the wiring isn't too hard to do. The guy who I bought it from had wired the headlights into turn signal curcuit, so I fixed the signal circuit. In process of wiring headlights. I just bought the sockets individually at Kragen (auto parts store like autozone) - You need one 3 wire socket and one 2 wire socket (GM '84 and up) - they were like 3 or 4 bucks each. I would've got a whole harness, but I was kinda working by trial and error and didnt have voltmeter either (you should have easier time b/c your existing wiring is correct for '83, mine was messed with). So change sockets and bulbs for headlights (you may have to for signals too - I didnt have any sockets on mine so I dunno if theyre diff. Everything else should be pretty straightforward, just keep track of all nuts and bolts and you should be able to switch the clips pretty quickly, and yes, I too believe the front bumpers are the same as well. I'm prob. gonna go back and straighten out the work that's been done to my car, so I'll have a better step by step breakdown by the time I'm done if this info isn't enough.
-mayor