That particular style of main bearing is as scarce as a chicken with lips, and usually VERY expensive if you can find them at all. There is a way to modify the block to accept the later type 1956-63 main bearings with a different method of securing them into place, however.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!