I'm seeing a lot of "tighten before loosen" comments, plus some interesting tricks and tools.
I also found a "trial sample" of kroil in my goody bag at work (I like to send off for free samples from magazines).
As a side note for my concern of having the correct screws, I got lucky and removed enough screws from a '58 parts truck to make a full set, in case I damage or have to resort to grinding off the problem screws on the '59.
Thanks guys, for all the suggestions!
I'll report back with some news... hopefully GOOD.
Jerry