64 barracuda runs hot

Had the same problem with my Fury when I put her on the road... Went over the timing, thermostat, running too lean and fan issues..... Was running the original radiator after just having it tanked... Still ran hot - to the H on the guesstimate gauge, and would boil over in traffic.... ended up taking the radiator to another local radiator shop and they suggested a high efficiency core between my original tanks..... Best $240 I ever spent on a radiator. This thing has the advertised efficiency of a 4 core, but is only a 3 core. Kept the factory look by keeping my tanks and even in 95 degree traffic, never goes above 1/2 way on the factory gauge.