EJ, as stated earlier there are different journal sizes.
"Small journal" SBC crankshafts are generally from 265, 283, and 327 engines up to about 1967. (excluding the 1967 350)
"Large journal" (sometimes called medium journal) SBC crankshafts started in about 1968. (again started in 67 with the 350).
"400 journal" cranshafts were used in the 400 cubic inch SBC engines starting about 1970.
Small journal is 2.00 rods and 2.30 mains.
Large journal is 2.10 rods and 2.45 mains.
400 journal is 2.10 rods and 2.65 mains.
EJ, just try not to sound so demanding when you are a relatively new poster on a site. The people on this site are great and knowledgeable, but the patience level can drop when you seem to demand answers.