Also thought I'd mention I think that hood props look cheap on hot rods, but everyone is entitled to their own opinion as well as restricted by time, money , and capabilities.
That being said, gas shocks I feel give a better function than springs giving a more consistent and lineal amount of push throughout it's range of motion than a spring, which gets weaker where you need the most strength in full up position. Biggest drawback to shocks is their approx 5 to 15 year lifespan.
With either springs or shocks, mounting positions & length of motion greatly affect performance and what strength & length of part to use. Further away from hinge pivot point requires less strength of part, but more travel,,, closer needs more strength & less travel. shocks can be set up directly from hood to fender with longer travel weaker shocks or on the hinges with shorter stronger shocks.
While starting from scratch takes a little bit of understanding as well as possible trial & error, this sort of thing has been done by many that could be copied off of a google search , as well as what is setup on these expensive billet hinges with shocks for your model & fiberglass hood choice.
Just a few thoughts. Also this is something that could always be done some other time.