Quote from luckyhipo
Food for thought--- I was recently talking to old timer about Block stamping and he told me that originally Ford was not stamping any blocks or transmissions due to cost. But Carroll Shelby insisted that any cars delivered to him had to be stamped. Since most of the cars delived to him either came from San Jose or Detroit the ones built in Metuchen were not originally stamped. If anyone happens to run into Carroll you might ask him and settle this once and for all.
I'm still researching this subject.
Don't really think we need to ask - since we have a fair representation of original examples of San Jose built K codes that were not Shelbys that were stamped on blocks and trans. Also documentation stating that it was done. Or at least was suppose to always be done 
Wouldn't trust what Carroll would remember either - he wasn't spending that much time with all the little details and I've heard him say enough things than conflict with the facts - so as always, listen but confirm
Always IMHO we have to take workers, individual statements, with a grain of salt and compare them to known facts.
Example -Had three of the ex workers (two that had worked at San Jose and one from NJ) in the shop last month. Each swore that a particular finish was never used on the underside of ANY Mustang. When I produced sections cut from floors of Mustangs - all they could say is that they never remember seeing those colors.
Can't swear that every plant - every time did it. But believe at least at certain plants it was the common practice. Now at the NJ plant - I think almost anything was possible 
