Daily driver in the city traffic or good distance running? A friend sent me this link on a 350 for $1300 with free shipping. Probably need a core or a charge is added.
http://dealnews.com/Chevrolet-Perfor...ng/866699.html
Good engine rebuild and tranny will cost at least $1500-$2000.
Call a local engine builder. Sometimes they have engines owners don't pay for. Shops will sell them for cost of parts and labor. You may find a great deal on one.