small block engine

I am interested in buying a good used or rebuilt engine does not have to be major Hp but would like something with some power. Looking to spend 2,000.00 or less. Must be in good shape dont want to do a rebuild. I can pick up within a day drive of me or shipping is ok if you are willing.I live in central Ky. Please let me know what you have, going in my 73 Duster.

thanks Bill