The #143 head was superceded by the #061 in mid 1967 production to allow the use of pushrod guide plates.
An early YC, YD 2-bbl 290 hp engine would have the #143 heads while a later XV, XU engine has the #061 heads.
HTH
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1966 GTO Tri-Power
1970 GTO TheJudge
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http://gtoaa.org/
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