[Mr70]

Begining in 1970,when the new RPO Z-15 454 Super Sport Chevelles & Elcaminos were assembled,they didn't have RPO B-22,(Door Emblem SS),listed seperately on their buildsheet orders.This was repeated throughout all assembly plants.
It was overlooked when they were upgraded from the base 396 RPO Z-25,which every 454 Chevelle had to start out as in the begining.Probably because on paper,RPO B-22 looked like a 396 specific ident,and not related to the 454's,so it was omitted in the translation.
It was presumed later on they would know to include the "SS" door emblems on the 454 equipment upgrade,but the trim shop didn't recognize it,and continued to use the "Malibu" door panel emblems on the new LS-5/LS-6 454's.
There is a TSB on this.
The Monte Carlos ironically,did have RPO B-22 automatically included on their build orders,probably because they didn't have an RPO Z-25 coded cars to muddy up the waters.
Also,some of the early built 1970 396 Chevelles were built with the incorrect 1969 design "SS396" door emblems.