When did they go to Unilug then? I thought I remembered reading (I wasn't there- born in '99) that most of them in the 1970s were unilug

No the originals were direct drill and they went to unilug in the late 60's, I "think". I bought a pair in about '71 and they were unilug and I was not impressed. Love them on our area cars, but hadn't bought any since that set. I'll be looking it at them again for my Chevelle's.