1967 had a 3F on the cowl tag, decklid drilled for 400 emblem lower passenger side), 400 grilles with chrome L shaped inserts and complete fill in of the bumper to core support (no holes) among the 400 hood.
As well, the air cleaner should be chrome louvered, and the valve covers chrome.
Block will most likely be YT automatic or WZ manual..there are other 400 codes, but very, very rare.
WQ, WI, WU, XN...maybe a few others..
what's the scoop on the XN? How very, very rare is it?