What do I do with 3 old cars?

I have 3 cars:
1998 Honda Civic LX
Poor condition 170,000 miles
Non-running due to cracked head.
Took to mechanic, he impounded it & during that time it sustained body damage & several int. Components were removed or busted.

2001 Mitsubishi Mirage ES
Fair condition 150,000 miles
Significant body damage but no critical damage to major components. Received as a gift from old neighbor who joined the service, so unsure of its history.

1976 Oldsmobile Ninety-eight
Fair condition given its age. Unsure of mileage since gauge doesn't move.
Runs but leaks oil.

Here's the question: I can't afford a new vehicle so do I keep the Honda & try to repair it or keep the Mitsubishi & have the body damage repaired. I want to the cheapest route but still have a car that's reliable & cost-effective. Can any parts from one vehicle be used on the other? What's the best way to get rid of the Oldsmobile & make the most money?