The date code E286 would be for May 28th 1976. The -4 or -8 will be stamped on one of the vertical castings next to where the valve cover bolts on. you will see a 1/2 inch square pad machined on the casting. the 4 or 8 will be there.
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1965 2+2
1966 Catalina Convert
1968 Firebird 350
1969 GTO
1967 Bonneville 4 Dr Brougham 428
1967 Bonneville 2 dr
1959 Buick LeSabre 2dr
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