This was before the great awakening (1975?) when all of those oil consumption, blowby, seizure, strange skirt wear patterns, short ring life, overheating, blue smoke, and low power problems were attributed to "I bored it 3/16", like always".
BJ said 45 years ago that a SBC factory 350 block must be bored .030" to remove the ring chamfer, but anything over .040" was only "as necessary", and .060" was the end of its race life. At that point, making a 301 out of a 283 was regular business.