just as an FYI, not all cars were numbered with 154 (V8) on the trim tag. I have a '66 Biscayne that was originally a 6cyl/3on the tree that I have converted into a L72/4speed/12 bolt. I have never attempted to change the original trim or vin tags and they both indicate 153 (6 cyl). Not sure if the Baltimore plant where my car was built did it differently than other plants. Tags are below.
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