Horrible News!

Guys I rushed and bought a 73 dart sport years back. Put a ton of money into paint interior engine transmission etc. Got to the point of having engine installed. My install guy told me I have three cracks on my frame right near where the k member bolts up. Its so bad on passenger side if you move the tire you can see the crack shift! I will be honest. I am super disappointed. I know anything can be fixed. But what are some options? Spending a ton more dough for this is going to be hard! Please help