318 LA rebuild after losing a valve seat

Righty; there is something wrong with your numbers. The standard size for a 318 rod journal is 2.125. Crankshafts and bearings come in .010, .020, and .030 undersize. --- So, 2.125 less .010 =2.115 -------- 2.125 less .020 =2.105. So, neither would work according to your dimension of 2.110 ! They make 'standards' which are highly accurate pins which are used to calibrate [zero in] micrometers.