[JoeC]

Jim - Welcome and its great to see you adding to the discussion here.
I know it was many years ago but do you remember this name "Excalibur”? It seems like Engineering used it as some sort of code name like in a James Bond movie. I have been following the story on the 68 Yenko Camaro engine for many years and there appears to be evidence for a 427 MV and a 396 MV. One thing I notice is the date on that emission test document is 6-21-68 which is very late in the 1968 model year since change overs began in late July 68 for the 1969 model year. That "GSD-578" form dated 2-13-68 requesting the 9737HD build for Yenko is also half into the 68-model year. If Yenko wanted to sell COPO 1968 Camaros I would think the paperwork would have to be started in late 1967. This leads me to believe that early 68 Yenkos were transplants. Just my observation. On the other hand, the paperwork Kevin has especially the GSD-578 seems to indicate a COPO 427. Also the article on the blue 68 Yenko Camaro in Super Chevy claims that car has the original motor and it is a MV code 427. They claim to have the POP and a broadcast sheet and the original owners name which they state in the article bought the car in December of 1968. I also heard of a 3rd 68 Yenko owner claiming to have a 427 MV code block with a Dec 67 date. (I have his name and have been trying to contact him) I am curious if the build dates of the MV 396 cars are all early and the build dates of the cars claiming 427 MV motors are later build dates. I guess it would be very odd for Chevy to build a MV code 396 and a MV code 427 but that sure would hide it from management if that were their intention.