Just a quick update. Colin confirmed that we have big problems. On the drivers side, we have 0 compression on one cylinder. They pressurized it on shop air and it came right back out the intake. Fun. They believe in addition to that it may be escaping into the crank case as well which would go along with my theory of combustion gases pressurizing the crank case. One other oddity- on the passenger bank, one of the middle cylinders was running extraordinarily lean and the other extraordinarily rich.
So, off to find another 3.9 for the Disco.
I was wondering who's super oily disco that was in Colin's shop