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I am working up the next plan and gathering appropiate new tools based on the discussions. I am not sure i need to pull the foam from the front half of the boat. From my current testing that is all dry, with maybe some damp spots around all the screw holes. The only reason i would consider pulling up the entire floor is to make it easier to reattach the floor.

Here is my next plan so far:
1. working from the back to the front use the electric knife / wire brush to remove the foam.
2. If I can remove the foam successfully, then i will need to brace up the floor. I can use 2x4 blocks to keep it from sagging.
3. If i can not remove the foam successfully, then i will proceed to cut out the section of floor over the wet foam.
4. remove the foam until i have removed all the wet foam.
5. go weight the boat - I am going to assume at this point the boat will weigh close to 250#. When i repaired the big hole from the outside the foam up the sides of the boat was dry. I don't expect to find much other water intrusion, other than the floor. Anything from the screw holes should be small and localized.
6. If we are significantly over 250#, look for more water, otherwise launch the boat in the yard to begin the refoaming process. This way I can tilt the boat and get the foam to run into any corners rather easily.
7. Position additional 1x6 boards where I will need backing support for screwing down batteries, gas tanks or the new interior.
8. Start pouring foam

chances are, on my next trip down to the boat, i will get started but by no means finished the next set of steps. I will keep everyone posted on how things start to progress.