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IR can help make more power by having the tall stacks that allow you to take advantage of Helmholtz resonance phenomema. The length of the stack has a fundamental frequncy (like an organ pipe) , get that frequency to be a multiple of the valve timing, and the column of air is allready moving towards the valve before it opens. This can get the volumetric efficiency of the motor over 100%, but you would have to have tall stacks, which would probubly be sticking out the hood of your car. Look how long the intake runners are on all new cars.
Low idle: same motor before and after. With the carb, 900-950 was a good idle speed. With the EFI, we could get it to idle all day long, at as low as 400 rpm, but still chose to have it at 850 anyhow. Low range torque was improved, but the improvement was all below 3000 rpm, which is not very important at the race track. Nice for cruising the street however, but this is pretty serious equipment for a street cruiser.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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