I can answer only in terms of Indiana law. With that in mind:
Anything acquired during the marriage would be half yours (any increased value in the home, his pension, etc.)
And I think you have a very good argument for an additional $13K in the house equity IF the 401K money was earned before the marriage, not during. If it was during the marriage, then it's considered part of the marital pot, just like his retirement and would be split evenly.
Sounds like you have a tough road ahead. Best of luck to you....