For cars that were built very late in the production year, I have seen much larger gaps between the engine assy date and the scheduled build date of the car. DId they get caught up on hemi building and start stockpiling them?
As far as the 66 in question, the IBM card will have the shipped date as well as the scheduled production date. The larger the gap between the SPD and the shipped date, the more plausible the late engine assy date becomes, IMHO.
it appears, yes, as the model year progressed there was more available HEMI inventory VS the plant waiting for engines to build the car early
but the IBM cards show when the car was "SCHEDULED" & when it was "SHIPPED" (it's gone, no longer Chrysler's & the liability changed) - it does NOT show when it was "BUILT" - a car could be still in Chrysler's possession (for days or weeks) for a number of reasons: unsold, waiting for transportation truck/rail/etc.
