You are completely right. You win.
Look,
I didn't come here to "win" anything.
I came to share information.
I hope you and those who read this will get the correct info so they can have their cars correct so when being judged they are being judged fairly and accurately where correctness and authenticity are concerned.
As a side note if you happen to have the 1968 Shop manual SOME of them have on the page before section/group 8 Engine a full page addressing the 427 engines as well as Canadian destined emissions and US destined emissions standards.
This page is likely not in the US printing of the shop manuals but is in the Canadian version.
Basically says 427 all have Thermactor and that X code 390s have IMCO and that 68 Canadian models have open atmosphere venting rather than closed system that US imposed regulations require/d.
PS when buying the MPC make sure its the international version as the US version is incomplete, does not cover Canadian DSO information.
:smile: