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Same with this 68 Camaro. 2 sizes of stamps. So there are 2 stamping dies that are used.
Partial VIN is "18U199887"
The partial VIN can also be on the oil filter flange instead of on the pad with the engine code.
The 70 should be stamped on the pad and by the oil filter flange. Where the 68 may only be in one of the 2.
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Your example is very wrong.
The engine you posted did not come out of a 1968 Camaro. No Camaros were built in Lordstown, Ohio. That motor actually came out of 1969 passenger car. "HK" was used in 1969 to designate 350/300 with powerglide. The number before the "U" is a "9". "U" is for Lordstown, Ohio. Passenger cars were built at Lordstown.
Also 1968 Camaro VIN's started with 300001 and 1969 Camaro started with 500001. So that motor never came out of Camaro.
Also I have yet to see a 1968 motor with the partial VIN stamped in the rough casting by the oil filter.
Rick H.