Don't know about the spring type but mine has a gas assist. The gas asssist doesn't actually assist much, and if you bump the rod while working underneath the hood will come down on you. Luckily if you are close enough to bump the rod you can catch the hood without it really slamming down on you.
If you would like these parts are available since I lost my Vette in a fire. PM me and I'll send them out to you.
Welcome to