OK, since like I said, I have both types of hoods...
Race hood has styrofoam glassed into underside but is still kind of a noodle, which is why it sagged around its perimeter; support was added to the car (not the hood) and in total weighs ounces.
Street (also 'glass) hood is lighter than OEM steel but being thicker and with the OEM-appearing underside bracing, it's more than double the weight of the race hood. Both have 6-pack scoops.
My racecar's hood is pin-on, street car uses hinges & latch but also has 2 pins at front. Street car doesn't use hinge springs, requires prop rod but still easier to deal with than the pin-on.
For a '71 Charger, if you're good at picking up a 4x8 sheet of thin plywood from the narrow end and lifting it, then you'll be fine...but I suggest you try it before spending $500-$700...