BBS, Where did you get the shipping date? What are the numbers off your trim tag for the build date of the body? Should be a two number code followed by a letter of the alphabet (i.e. 07A would be 7th month, first week, 10C would be 10th month, 3rd week). Once you have the build date, then I believe you should have drivetrain dating 2 weeks to a month prior to the build date. Not positive on this, but I think that's the range.
1956 Chev 150 2dr sedan 302ci
1965 Chev Malibu 2dr hdtp 496ci
1967 Chev Camaro 327ci