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Plant designation didn't start until the 1968 model year, and the 429 tail housing was used thru the 1970 model year in Pontiac A-body's...Hope this helps...Crash
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Found this in the site below for what it is worth:
"Beginning in 1968, the car's last eight numbers of the VIN were stamped on the transmission. As with all car productions there are exceptions to the rule. One good source has a late model 1967 GTO with the VIN stamped on it. "
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GTO Alley </font>
Other useful info found on this site too.
Sam
