Identifying Direct Connection Valve Covers

33IMP said
According to what i found, DC program ran from 74 thru 87, then changed names. I would have said somewhere in the eighties, for original issue.

This is very helpful. Thank you. Is the baffle on the inside the way to tell these apart from the newer ones?

For my own knowledge, if I ever come across another set I'd like to know how to spot them.

Thanks again