John, I believe I emailed you a page from my Federal-Mogul shop specifications manual that has the crankshaft dimensions listed. Your machinist is right about the main bearings having different diameters, with the largest one back by the flywheel. I can re-send that page if you need it- - - -it's also got info on oil clearances, etc.
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!