Ron:
You are obviously a wealth of knowledge regarding the '60-'66 Chevy trucks. I attempted to share my personal experience with these trucks and the information stated in the published literature. Apparently, that intention was lost in the evolvement of this thread, therefore, I respectfully excuse myself from this thread and the others, where we seem to run counter with each other.
In reply to your statement that "you have noticed discrepancies on posts of my knowledge of these things", my reply is, I try to relate my knowledge, experience and GM references in helping others learn about these trucks. For example, when I see a '60-'65 Chevy C10 truck being advertised with a factory original 327 sbc, I feel compelled to let the would-be buyer know that a 327 sbc was not available in a C10 until 1966, therefore buyer beware.
In closing, I take a great deal of pride in helping others with their passion for '60-'66 Chevy trucks and make every effort to share as much information and experience as I can, in doing so. Perhaps my sharing of information about '60-'66 Chevy trucks, comes off to some as, "know it all", but that is not my intention.