On the VIN:
6 = series - Invicta
H = year - 1961
4 = assembly plant - Kansas City
019634 = sequential build number, starts at 001001
On the motor (same as the VIN of the donor car):
4 = LeSabre
J = 1963
4= Kansas City
016624 = sequential build number
To learn engine rating, we need the engine production code number stamped on the right side of the block similar to the engine serial number on the left side. Format will be something like JS123. It is a 401 with 2bbl low compression, 2bbl high compression, or 4bbl high compression rating.
On the body:
BK = built in KC
2154 = 2154th Invicta 4 dr HT built at KC
PS, PB, AC were all optional on the Invicta. Attached is a list of the standard features from the dealer brochure.
What has been, can be again. (Bob Wills, 1942)