"068 was in all 1970 RAIII engines, as well as 71-72 455HO - and the same lobe profile and timing as the one used in 73-74 SD455 engines."
1973-74 455SD engines used the same lobe profile and timing as the 744 grind.
Was planned for the 041 cam but did not pass emission test.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
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