I have a 68 Chevy C20 truck and the original 327 V8. It shouldn't make any difference if is a 6 or an 8, if they used the motor ID in the VIN. I don't have the VIN # on the dash either. I did check the motor ID against the VIN on the registration and no match. Which is to say then that it may have to be 70 or later as Tom says.
Larry
