First, It is Yenko Novas that came with the CE 427s. Yenko Deuces had 350 LT1s.
What has led you to believe that this is a Yenko 427 engine?
I only have the word/story of the person who actually pulled the Yenko Nova 427 which I have,it is CE 955290 Cast date J 22 8.
Just as Keith stated, untill documentation surfaces it's Just a replacement 427.
