There's still plenty of good-condition crankshafts available. One salvage yard in Albert Lea Minnesota has several on Ebay most of the time. Shipping charges are a little steep, but they even have a few standard-diameter ones listed.
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!