Rule of thumb: To lower the back of the hood, raise the front of the hinge and/or lower the back part of hinge. As explained in one of the above posts, loosen the hinges at the fender, pick up on the front of the hood, and retighten. Sounds backasswards, but it has to do with the hinge geometry.
If the back of the hood is still too high after being maxed out you can add shims or washers at the front hood bolt between the hinge and hood. In other words, raise the hood higher at the front bolt.
I agree that if you have to resort to all this something is tweaked beyond limits, but on these 40 year old cars, the hood alignment can be an absolute freakin' nightmare. I have had to porta power the front of the fenders apart, loosen the core support and shift left or right, add/remove the hood to fender wedge rubbers, bend the alignment/retaining pin that goes into the latch, re-arch the back of the hood in order to clear the windshield wipers.........and on and on and on. The hood issues on these cars are the worst. Good luck.