Looking for info in the right place helps.
Looks to me I have the proper factory plugs for 68 BB with cast heads.
Search over.
Enjoy or ignore.
Choice is yours.
Pic 1 from 1958. Note no green rings
Pic 2 from 1962
Pic 3 from 1966
Pic 4 from 1967
Pic 5 from 1968
Pic 6 from 1969 and it also has good info
Pic 7 from 1969
Pic 8 from 1970
Pic 9 from 1976 and shows wide top green ring. 1974 does not.
Pic 10 Dec 1970 and shows introduction of HI PERF plugs
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