I concur with those that say change the motor, best cleanest safest way to do so.

$34 at american classic, you may find for less somewhere. Was a perfect fit in mine.

http://www.americanclassic.com/Google_Base_HTML_Pages/EL116-1951.htm

Mike


1951 Chevy 3600 rust bucket with GarWood dump bed conversion
http://www.flickr.com/photos/mikeybs51chevy