I think everyone is over thinking the removal of these bolts. I've pulled a bunch of them off over the years and have never had any issues and I live in one of the worst environments for rust. In fact took all 6 out of a junkyard 80 last week that had no hood on it.
And how much of this magical oil do you think is going to get around the flange head of the bolt, past the corroded heat shield and down into the threaded portion of the manifold?
Unless these bolts have been previously removed they should come right out.
I had no problem removing mine from the truck to paint when i did the VC replacement. When reinstalling th heat shield i used anti seize on the bolts.