ID this 427 out of the 68 Camaro

[69LM1]

Here is all the 10xxxxxx casting numbers listed on www.mortec.com/bbc.htm:
Double check those numbers, none seem to match here.

10051107...454...............4-bolt, Bowtie, MkIV, 9.8" deck, siamesed cylinder barrels, 4.25" semi-finished bores, can be bored to 4.50"

10069284...427T..............4-bolt, Mark IV, Tall deck

10069286...454.......90-91...4-bolt, Mark IV, Short deck

10114182...454.......91-up...4-bolt, Gen.V

10114183...366T......91-up...4-bolt, Gen.V

10114184...427T......91-up...4-bolt, Gen.V

10134366...454T..............4-bolt, Bowtie, Gen.V, Tall deck

10185050...454...............4-bolt, Bowtie, Gen.V, Short deck

10237297...454.......96-up...4-bolt, Vortec 7400", "L-29" Gen.VI

10237300...502.......96-up...4-bolt, Gen.VI, 4.466" bore