99 at AB would be special-order engine per the codes on some websites.
But I once had a 65 Dodge 880 with a 383-2, and it had a 99 for engine code (which matches the black snip below).
My 300L also has a 99, and Simplexco says 65 Chrysler AB of 99 is for 413.
But a different website says 413HP is a 71.
Unless my 300L became a 99 because the 413HP was standard there, and because mine has PCV on it. ???
Tomatoes are fruits but the grocers put them in with the vegetables...
1965 Mopar Fendertag codes
View attachment 652352
1965 Chrysler Data Tag
View attachment 652351