Yes,that is the W-72 motor,and DEFINITELY a keeper.
It was a thicker block,better oiling(starting in the later half of it's production),starting in 78 the bigger cam putting out 220 hp,better valve springs,whole bunch of better stuff than just a L-78.
These cars with the "Z" code are getting harder to find in any condition,I know,I looked for a good one for a while.
Nice find
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1973 T/A Buccaneer Red L-75 A3,83k mi. #'s match
1979 T/A Atlantis Blue W-72 WS6 23k mi.survivor#'s match
1999 T/A Navy Blue 60k mi....babied
1968 442-gone but not forgotten
"Oh,you can think about it,.....but don't do it!"
Sheriff Bufford T.Justice