I had this issue w/a 72 I just bought. There were two problems, first where the rod connects to the latch, one of the tabs was broken off. After I TIG welded it back on, I was still having the same issue.
I solved mine by looking at the mechanism and each piece had just a little wear. When it all added up, it was enough to prevent the secondary latch from clearing. Plus those hoods jump up really fast w/both springs. I solved it by welding a little more material on one of the levers to make it so the secondary moves sooner. You have to be careful not to add too much.
Now my hood opens w/out having issues 90% of the time. When it does get stuck, all I have to do is gently push down and pull the rod to release the secondary.
Good luck w/yours
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