and I have those "viagra hood hinge springs" on mine! the 'extra' help to get it to stay up! lol... I added the inner (of doubles) hood hinge springs from mid 80`s Volvo 240 (they added one when they went to the hood that wasnt totally flat) and those can be "fished in " to your GM hood springs on the Firebird w/o removing them.
I went that way after having replaced mine with new repros , but they only lasted 6-8 months...