What's it worth? 1965 273 2bbl engine and 904 trans

I bought a 65 Valiant Signet in Sept. It's a 273 2bbl with a 904 trans. The engine and trans are both in VG condition and a guy is wanting me to put a price on the combo. Being new to the small blocks I really haven't a clue what it's worth. The engine and trans need nothing. Any suggestions?