I think all coils should be mounted vertically to prevent overheating. Most all sportsmen class roadrace cars that I've seen, like Formula Ford, VW and BMW for instance, have the coils mounted vertically, higher than the engine and in line with the center of the car.
A forum community dedicated to 1955, 1956, and 1957 Chevy owners and enthusiasts. Come join the discussion about restoration, engine swaps, reviews, performance, modifications, classifieds, troubleshooting, maintenance, and more! Open to all models including Belair, 210, 150, Sedans, and Nomads.