At first glance, it seems simple to open the hood scoop, but would be a lot of work for very little gain. Take a look under the hood and you'll see a wide support brace that would block over half of the opening. In addition, the mounting pins for the scoop itself are pretty well in the middle. It would be a lot of work for a small hole.
HeadacheGuy, as usual, has good suggestions, but first thing I'd do is check the thermostatic fan clutch. These things have a relatively short life (I've read that they lose a couple of hundred rpm a year), and a slow fan will overheat the engine compartment long before it shows up as a cooling problem.
Terry
64HT