Found my dads original 1971 duster!

Did Mopar stop using shrouds for awhile? Went out to look at my '73 project car and no shroud and no holes in the flanges for one. It's a stripper /6 model so doesn't mean the 340 cars wouldn't have one. I though maybe I could give some insight as to where to drill the holes.
Funny you say that. Nigel, at national moparts was so baffled by my rad that he pulled 2 of his reconditioned ones down from storage to show me what mine should look like…..only to see that his didn’t have holes either