Seems this thread has gone from "something wanted" to a discussion about your Nova
Very cool car for sure.
You keep referring to "427" Aluminum Heads. I could be mistaken, but I believe in 1969 certain heads were used strictly on 427's (L88 & ZL1) while others were used on both 427's and 396's (L89). Be interesting to know if the dealer installed 074's or 842's.
Good luck with your car search.