I'm in the process of doing this on my 88. Nothing difficult, just time consuming. The hex bolt referred to earlier is right in the center of the upper intake. Look down from the top and you can see it.
I used a 3/16" allen head socket, quarter inch drive,and a 12" extension to get to it. A 3/8 drive socket will not fit. Not too sure how I'll get it back in the hole and started, but I'll worry about that later. It took me about 1 1/2 hours to get everything apart(working slow), not including the cuss session for the Ford engineers on my way to Sears to pick up the needed socket.