Another option which I'm setting up to do on all the stovebolt engines I intend to build going forward is to machine all the main bearing journals to the same diameter (Chevy small block 400) and put reducer bushings in the block to equalize the bore sizes. That eliminates the 4-size bore problem. Then I'll line bore and line hone the block one time and have newer, more affordable main bearings to install. I'll also machine the thrust faces on the #3 main web to use a permanently installed bronze thrust washer instead of a flanged bearing shell to control crankshaft thrust.
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!