Data, talk to Willie at Hood Hinge Repair.
https://www.hoodhingerepair.com/contact/
IIRC he advised me that the repop springs were for a Chevelle and didn't have the same coil count or strength as the 68-70 LeMans/GTO. In addition, the 71-72 GTO hoods were heavier and had stronger springs than the 68-70.
On his website, he says the only way to check for hinge wear is to remove the springs.