1968-69 340 timing cover

jefflock said

I don't have with marks on the passenger side. The one I have has no marks on it. I thought there was a tab that went with it.

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The no-boss type is early '68 and earlier 273, 318, and 340. They use a bolt-on timing tab. Very late in '68 they went to the cast-in timing indicator and all '69's used them. Then in '70 they went to the drivers side indicator.
Thanks, Mark