You definitely have some decisions to make.
If it were me, I'd drop in a used motor, and drive the car until something else went south that was too much to deal with, or until I had too many children to fit in the car.
I had to swap the engine on my Bonneville because my engine blew within 25 miles of buying the car.
I did it myself in my garage with practically no physical help from anyone. If you have the place to do it and a little help, it is a very doable project.
But, if you just want transportation for six months, you could find another ride for the cost in $ of a used motor, and just scrap the Bonneville. When you find the car you really want to spend the $ and sweat on, jump out of that into the other.
I have a friend that had a '91 Buick LeSabre that she really wanted to fix up nice so she could trade it up. It ended up in a scrap yard and I gave her my '94 Grand Am. Now, she wants to do the same with it.
My preference is to drive a car until it is used up and worthless and then go get another and do the same. I haven't always done that, and whenever I have chosen to sell a running car, I rarely felt as if I had come out ahead by doing so.