I dont think the louvered inspection lids would be the best way of getting rid of heat on hot days. Or at least its the most round about way of doing it, unless you like the look of them.
Upgrading your cooling system would be money better spent, like a good electric fan, or aluminum radiator. Or just drive around with your hood popped up and the latch kept to leak out the heat if its really a problem and your stuck in traffic.
the car doesnt overheat radiator/water wise (it stays right at 185), its just **** hot under the hood air temerature wise and it gets vapor lock ocassionally and i do not want to put a electric fuel pump on it, unless absolutely necessary.
i have already wrapped the fuel lines and that helped alot, but every once in a while its a pain in the a**. half the problem is those **** small metal lines off the fuel pump to the carbs.
yup got heat shield, but the heat off the headers is dang hot as they arent coated. im not so worried this late in the year, but gonna work on solutions this winter. coating the header isnt in the game plan as its a daily driver and there isnt time to do it.
Do have a hotrod shop around? You can take your inspection covers off and have them press louvers in them. Heat rises and will find it's way out. With the car moving it will aid venting as well. I seen somewhere someone louvered his or her entire hood. Looked crappy to me, overkill. But if you put a couple on the hood in a designed pattern maybe it would look good. Maybe just punch the louvers where the 77,78 has vents.