I have to admit I know nothing about these engines but what about the thought of repairing/rebuilding it yourself? Maybe you have some family or friends that could help? That is, assuming you know what exactly is wrong.
I just replaced the head gaskets in our Subaru (common issue) and saved about $2000. Haven't messed around with engines for 20+ years and was reluctant to do it myself because things are so complex these days. The great thing these days is that there is a Youtube video on how to repair just about anything automotive related. After watching a couple of them, I found taking the Subie engine apart and re-assembling pretty straightforward. I took the heads into a machine shop to get checked out which were fine. I had the check engine light come on at first and I kinda panicked. Bought an OBDII reader and found that I had just overlooked plugging a connector back in. I already had all the necessary tools though, which some may not have. I also managed to rebuild the entire front end of our truck last year and Youtube videos made it so much easier and re-assuring.