It cools fine, when driving around...but when sitting still, as in a long stop-light, the temp starts rising and won't go down until I'm moving again. A shroud will help the fan draw more air through the rad while sitting and idling.
This is the exact reason why you'd want a shroud. I think using a 68 shroud on your current radiator even if it involves some ingenuity is probably easier than finding and welding tank brackets to your new recore. :)
