I asked this question a week ago.I have a 1968 that the build date is 4-12-68.I have a motor that looks like it says 3-30-68.I seen on some website the block castings where in clumps,mostly 1966 I beileve like 6 differant castings dates and 65 had 2 late and 1968 had 3?My car is an export would it have a closer date or later?Thats why I figure mine might have the closer date,because of export?But was there a 3-30-68 casting or am I reading it wrong?There is no other #'s anywhere on pad or on railside or underneth.