A friend of mine once showed me his little trick, a 'cool can', basically an aluminum can that shielded the fuel line. Said it gave him more power. Seems to be a little opposite from our 'heat the fuel' ideas.
The motor was a built 340 so perhaps dumping more fuel into the engine did get him a better change to burn more fuel/have more combustion.
Speaking off....when I was out at a cruise night with my friends MP Crate 360 78 Aspen, when he started it up it rumbled nicely, but I noticed that if you put your hand around the exhaust, you get quickly covered with 'black stuff'. He said this is 'normal'. This is another 'built motor' and runs a Demon Carb on it.
Now, what I'd like to know is how to 'fix' that. Can it even be fixed on a carb'd 400HP car with something simple or would one need to completely rebuild the carb and tune it to the max?