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Another thing , a huge coil will not put out any more voltage then an HEI , unless the system demands it . Higher compression and other mods can call for another coil , but at idle they will put out exactly the same KV cause it fires when the voltage has increased to the point it can jump the gap , and nothing more . I doubt you'd see any increase at all on a dyno so the track rules just saved you some money . Now if yer hunting for power , the carb is the place to find it , most are in need of improvement metering wise , and I bet you can count on one hand the guys with jets in their trucks , no jets means no tuner to me , buy it and bolt it on and if it needs anything at all they send um back for another guess by the fellow a thousand miles away . Carbs when they are tuned right are very sensitive to air temp . Course I guess I was the only guy with a dual snorkel cleaner with pipes to the front so I didn't have to run hot air and lose power to the engine . The engine likes 100 degree air , for every ten degrees over that you lose 1% hp , according to Smokey Yunick , so say yer air is 150 degrees , with 300 hp that's 15 lost hp . It's all them little things that make a car faster , cause they won't let ya do big things .