360 V8. The pics are lousy but car is priced at just $1000. While not advertised as the 5th Avenue option, I believe it is based on the 1979 brochure. http://salem.craigslist.org/cto/4871013033.html
It is the 5th Avenue, all right, and it looms to be in great condition. A date luxury car, and a beauty at that. Hope someone who appreciated her gets the old girl.