It won't date code to any production car so that really hurts the value for some buyers. For a "hot rod" build, I think I'd go with an aftermarket block for that kind of money. Wasn't this (June 1970) from that time frame of the "bad batch" 427's? Might need to check it out very carefully.
EDIT: links added
http://www.network54.com/Forum/74182/message/1335223852/%26quot%3B+Barn+%26quot%3B+find+....+new+side+oiler+block
http://www.network54.com/Forum/74182/message/1334325699/NOS+427+SERVICE+BLOCK+INFO
