When I read the post from the Byrne Bro mechanic in NY who said he replaced the ZL-1 engine in a black ZL-1 Camaro in 1970 or 1971, I thought of ZL-1 #12 that was in NY and was black when the second owner Eddie bought in about 1976 and it did not have the original engine
#12 was in Floral Park, New York about 32 miles from Byrne Bro Chev
Eddie says it has a CE block in it
photo is Eddie towing it home
youtube with Lou C. and Eddie and ZL-1 #12
https://www.youtube.com/watch?v=hU7PqMz3XPo
link to 2004 feature of ZL-1 #12
https://www.yenko.net/features/2004/August2004.htm