They're easy, but messy if your engine is grimey. If the 85 mount is anything like the 86/87 mounts, you will be wanting to get an 8mm allen head socket and a big cheater bar to break loose the bolts that go in from the bottom. Tons of threads on this. If you read up and have everything anticipated, it might take you 2 hours for both sides. A floor jack is really helpful too.