Sorry to resurrect such an old thread, but I am looking to purchase a 1966 Hemi car and was wondering if the following information seems plausible for this being a numbers matching car :

Vehicle production date is December 13th 1965
Casting Date : 8 -17-65
August / 17 / 1965
Engine Pad breakdown
B : 1966
H: 426 HEMI
12 - 16- 14
December 16th
14th motor of the day

I know that in most cases the engine casting and assembly date would usually be weeks to months BEFORE the scheduled build date of the car, but I have also heard that with Hemi cars this time frame was not always the case. Seeing as the engine assembly date is such a short time after the build date of the car I thought this could quite possibly be the original engine to the car but wanted to check with some others who are undoubtably more knowledgable than I am. Thanks!