After another week of soaking the two remaining frozen nuts, a mechanic friend was able to remove them with considerable effort and ingenuity. He took the manifold home to continue working on it in his shop and got it all apart on Sunday. He called to tell me that the aft end of the manifold near the flange is so badly rusted that one of the 4 studs came loose. I also have to get a flange fabricated since they are not available any longer. And since it appears I have a similar problem beginning on the port side, I'll have two made. Probably not a huge hurdle, but it is a speed bump in the process.
I haven't seen the manifold apart yet but will see it Thurs when I return home from a trip. I will look into repairs to the manifold since the price for a new one is north of $1800. Am also checking for used and other new parts sources.
I agree that I need some of that cheap diesel. I hope it stays low long enough for me to fill up cheaply.
Sorry for the thread hijack...