GTS engine ID

For pre-'69 cars, the sequence, build number, or whatever may be stamped on the right pan rail or around the bellhousing area. This would be the same number that is at the end of the fender tag. This number would be compared to the broadcast sheet which would have that same number, along with the VIN.
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That would be 68 only and it would be on the bellhousing flange near the hole where the oil idiot light sender is mounted , 67 and earlier engines you can only use the assembly date as a GUESS if it's the original or not .