Dual valve springs stock on 2.02 915 J Heads?

Picked up a set of 915 2.02 J heads for my 390 stroker build. I was making sure my Hughes adjustable rockers set up properly since I just got some hold downs. The Previous owner said the springs were stock. But wasn’t sure J stock springs were dual. I know my 675 heads were not Dual. And if they are not stock, what is the best way to tell what they are? I know my Hughes rockers are very snug around the springs, they are for up to 1.5” diameter springs. I Didn’t expect that either.

Thanks for the help.