I have seen many cars with original blocks in them like mine. The "engine number" that deTomaso stamped in the upper left side of the block that corresponds to the engine number on the plate riveted to the body doesn't seem to correlate what so ever with the chassis numbers. For instance, my motor number is a higher number than other cars I have seen with higher serial numbers - the point being I believe the factory didn't give a crap about what motor they picked. They simply built the car with the next motor from the pile. You would have to assume somebody had the job of inventorying motors, stamping the number on each and making the corresponding body tag. Or perhaps Ford pre-stamped the motor numbers before they shipped them. That I dont know.
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