the closest cast 1/15/68 to assembled 3/12/68 dates I have any info on are ~2-months, but most are much longer - that may be due to size of batches & rate at which they were used was it intentional??
the '66 & 1/68 blocks don't have the raised pad for the VIN stamp
I will check again, but I have a 1/15/68 block assembled 24May68 and it has the raised pad for a VIN but it is blank. Vin is in the normal spot for a 68 hemi motor.
Dragon Slayer, I may have asked you in the past about the 68 block that you mention, but can you PM me or post the partial vin information off that block. Thank you, Matt
was it intentional?? 
