Hey folks. I have a 1980 El Camino and was wondering if they ever came with an air dam under the front core support? Is this something I can add, and would it make a difference? My car tends to heat up a bit at highway speeds. I have a clutch fan and a one row plastic tank radiator in it. Cools just fine in town and does not overheat a speed, just tends to run about 210*. Wondering if putting in an air dam can help that at all?