Another member may have a better answer but...

I don't have the answer on that hood but on my sons 67 Dart hood and fenders the "Street" weight glass are most likely as heavy or heavier than stock. His HEMI hood may be a bit lighter than the stock hood but not by too much, maybe 5 pounds or so. But his fenders are very heavy.

Race weight fiberglass is much lighter but will crack in use. Not may crack, it will crack. But it is an easy fix and you can add a layer of glass mat on the underside over the common crack areas.