Is Engine Original To Car?

[HOT3O2]

I came across this car on e-bay and he states the drive train is original to the car. It's a 12B and the engine is stamped V0913DZ. Could a December built car have a Sept. built engine?

http://cgi.ebay.com/ebaymotors/Chevrolet-Camaro-X-33-Z-28-69-Z-28-X-33-W-302-Muncie-4-Spd-12-bolt-posi-axle-/120993835862?pt=US_Cars_Trucks&hash=item1c2bcb6b56

[restore-z28]

Holly fender flares Batman, no vin number provided in the listing but if this is an early build then the partial vin number would be stamped on the pad, if a late built then down by the oil filter boss.