Do I fix my Mercedes I love or say goodbye?

[Vicstasi]

Hi everyone. I have a 1988 420sel Mercedes. I need a rebuilt transmition for sure because it won't go in reverse any longer and on the way home the timing belt snapped and put a gash on the engine block. So, i dont know what that will involve to fix. I have replaced so many parts on this car. I was wondering if I should continue and go forward to fix these new problems or just cut my losses and let my car go? I wanted to fix it for one of my children to drive since its such a tank! Thanks for the advice.