[Mr70]

There is not a lot known about these 1968 L-89 cars,but I do not like what you have relayed so far.
To recap:
*The #440 block is a LATE 1968(August)to EARLY 1969 production ONLY.
*They ended 1968 Baltimore production in July,1968,& Started 1969 Production in September 1968 with unit #300001.
*The casting date of G 11 8,July 11th,1968 makes sense.
*The Tonawanda assembled date of T 08 24,August 24th,1968,makes sense.
*The VIN# you supplied me with,is a mid May,1968 Baltimore,Chevelle-Elco VIN.
This is the problem area,& NOT a 1969 VIN# either,it should not be before the other two mentioned dates.
*I don't know where you are getting the Post Car possibility?