Found this on racing junk.
The I.D # on the passenger side front block deck is T0109MY, the partial V.I.N. is 18L326299 & the casting # is 3916323. The heads and block are January '68 date codes. I have the block, crank, heads, pistons & rods. The block is standard but needs to be bored and the crank will need to be polished, possibly turned.
http://www.racingjunk.com/category/95/Street/post/2247035/Factory-I.D.-Code-68-Camaro-396-325hp-Engine.html