Each one of you have been giving great advice and I've been doing much of what you've said. I submerged the front end of the intake in evaporust. I am very impressed at its abilities and now I'm waiting on the PB Blaster to work for a day into those threads. I think the corrosion beyond the intake-fitting interface has been cleaned away. I am determined that this intake survives. It cost $120 shipped! Nobody touched it because it wasn't pretty. All of the threads have cleaned up and the fittings I got back were still usable (aluminum thermostat housing, thermostatic vacuum valve, PCV elbow, and the air breather vacuum fitting) with the exception of the sending unit. I'll post pictures of my mini-saga soon as I have them. Looking forward to completing the next step in getting my bird back on the road. The battle is worth it.