Malcolm Dunk has owned his ’65 El Camino for years. It’s overheated for years. And he’s torn his hair out trying to fix it for years. The present combo sports a mild, 9.5:1-compression, 0.030-over, 350 small-block with an RV cam, an Edelbrock 600-cfm Performer carb on a Performer intake, a Performance Distributor large-cap DUI spark-sorter, and small-tube headers. A swapped-in 700-R4 automatic overdrive transfers the torque back to a 3.73:1-geared 10-bolt rearend. Up front, V-belts spin a Sanden air conditioning (A/C) compressor, a generic “long-nose” iron water pump, and a power-steering pump. Like many old cars, the pulleys and brackets are a smorgasbord of wrecking yard and custom after-market brackets of unknown origin. Still, Dunk’s four-core desert cooler radiator, beltdriven flex-fan, coolant-recovery tank, external auto trans cooler, and…