A good running slant 6 in Northern California.

An older retired neighbor has a 60s dart that she has had for many years. Recently her engine lost a cylinder and it runs really rough. If anyone has done a V8 swap nearby and has a good running slant taking up space that they could sell to her for an inexpensive price please let me know. I could travel from Lake county down to Monterey, and east to the Sierra foothills to pick up a good running long block, no accessories needed. Thanks for any help.