Nice to see that you had such great results on the el camino. i assume you still have the factory Quadrajet on top. they have tiny front barrells and you can can get relatively speaking great mileage from them as long as you keep the back bores from opening up by stomping on it.
As much fun as it is at the track best way to clean carbon is via Seafoam l ike another person suggested. i wouls say that you must have more of an exhaust blockage then a carbon on the valve issue to achieve those great results. if you haven't reworked your exhaust you may want to look at your cat it may be breaking apart causing restriction.
Clean air filter, Plugs, wires, cap, rotor, a good coil and a oil change go a long way in getting you improved mileage
for taking it to the track and a 15.09 is not a stock time for that ride
You should have been sporting a mid 17 in the 1/4 stock or there abouts.
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