I bought a real nice one out of a 57 truck at the Springfield, MO swap for $200.00. I bought it from someone that I knew and trusted from my home town. It needs a starter, flywheel, 216 bellhousing for my 53, and alternator/generator if you have extras. It's clean and turns over freely but I havn't started it.
http://i4.photobucket.com/albums/y133/orange54/FirstTry022-1.jpg It was replaced with a Lt1 350.